Best Knockout Sets for Drills and Electrical Conduit Work
The best knockout set depends on your driver: the products below include manual ratchet and hydraulic kits, plus punch-and-die options that may be used with compatible drivers. They are designed to make round openings for conduit in panels and other materials, but not every kit connects directly to a standard drill. The Growlush set is best for listed 10-gauge mild-steel capacity; the UTZIKO is best for buyers seeking a hydraulic pump; and the AMZCNC set suits shoppers looking for a compact manual kit with six common conduit sizes.
| Product | Best suited for | Size range |
|---|---|---|
| Growlush Ratchet Kit | Slug splitting and stated 10-gauge mild steel capacity | 1/2 to 2 inches |
| UTZIKO Hydraulic Kit | Hydraulic operation | 1/2 to 2 inches |
| AMZCNC Manual Kit | Portable manual punching | 1/2 to 2 inches |
| iGeelee Ratchet Kit | Six metric-listed punch sizes | 22.5 to 61.5 mm |
| IBOSAD Punch Kit | Smaller four-size selection | 1/2 to 1-1/4 inches |
Growlush Ratchet Knockout Kit
Best for: Users who want six common conduit sizes and a ratchet-operated kit with stated capacity for mild steel up to 10 gauge. This set includes dies for 1/2-, 3/4-, 1-, 1-1/4-, 1-1/2-, and 2-inch conduit sizes. The listed actual hole diameters range from 0.885 to 2.416 inches, so match the specified hole diameter to the fitting rather than assuming the conduit size equals the opening.
The listed split-point design shears the slug into two pieces to help it release from the die. The product information also lists aluminum, fiberglass, and plastic as suitable materials. Choose this if slug removal and the stated mild-steel capacity matter. Avoid it if you need a powered drill kit: the product description identifies a ratchet wrench, not a drill adapter.
UTZIKO Hydraulic Knockout Set
Best for: Buyers who prefer a hydraulic driver over a hand ratchet. The kit includes six dies from 1/2 to 2 inches and a separable hydraulic pump. The manufacturer lists standard output pressure of 8 tons and maximum pressure of 12 tons, plus a safety valve that releases pressure at its stated limit.
The listed capacity is 1/8-inch (11-gauge) steel and 1/16-inch stainless steel. It is a better fit for a buyer specifically seeking hydraulic operation and a broad size range. Its pump-driven design is not the same as a standard drill-powered punch, so avoid this option if direct drill attachment is essential.
AMZCNC Manual Six-Size Punch Kit
Best for: Users seeking a compact manual set covering six common conduit sizes. Its punches are listed for steel, stainless steel, brass, copper, soft aluminum alloys, fiberglass, and plastic. Maximum stated thickness is 1/8 inch for steel and 1/16 inch for stainless steel. The long handle and compact storage case are useful features for manual work and transport.
The product is described as a manual punching machine, not as a drill attachment. Its material limits matter: choose another option if your work exceeds the listed thickness or requires a powered drill driver. It was selected for its size range, material list, and explicit capacity guidance.
iGeelee Ratchet Knockout Kit
Best for: Buyers who want a ratchet kit with six metric-listed punch sizes. The listed sizes are 22.5, 28.3, 34.6, 43.2, 49.6, and 61.5 mm. The product description emphasizes round, clean holes and an ergonomic long handle intended to reduce effort during manual operation.
This selection may suit jobs where those exact metric dimensions match the required opening. However, its listing does not provide a material thickness capacity or name the sizes as standard conduit trade sizes. Confirm the required hole diameter before choosing it, and do not assume it is drill-powered.
IBOSAD Four-Size Punch Kit
Best for: Buyers whose work only needs 1/2-, 3/4-, 1-, or 1-1/4-inch conduit sizes. The product includes a wrench and lists capacity for mild steel plate up through 10 gauge. Its description says the punches may be operated with manual, ratchet, hydraulic, or battery drivers, but notes that when using those drivers, the draw stud is part of the driver kit.
This is a smaller size selection than the six-die options, and the listing explicitly says it cannot be used for stainless steel plate. Check what driver components are included before purchase; do not assume the punch-and-die set alone includes a compatible draw stud or powered driver.
Buying Guide: How To Choose A Knockout Set
Do you need a drill-powered set or a manual kit?
Check the operating method before buying. A ratchet kit uses a hand wrench, while a hydraulic kit uses its pump. A punch-and-die set may require a separate driver or draw stud. These products are not all standard drill attachments, so confirm the required connection and included components with the product listing.
Which punch sizes and hole diameters do you need?
Compare the required opening with the listed hole diameter, not just the conduit trade size. The Growlush listing provides actual hole diameters for its six sizes. The IBOSAD set covers only four sizes through 1-1/4 inches, while the AMZCNC and UTZIKO kits list six sizes through 2 inches.
What material thickness will you punch?
Match the material and thickness to the stated capacity. AMZCNC lists separate limits for steel and stainless steel; UTZIKO also specifies stainless-steel capacity. Growlush and IBOSAD list mild-steel limits, and IBOSAD says it cannot be used for stainless steel plate. Do not infer capacity for an unlisted material.
Is slug removal important?
The Growlush listing describes a split-point die that divides the slug to help it release. Other product descriptions do not specify this feature. If slug handling is a priority, compare die design and removal details before selecting a kit.
Frequently Asked Questions
Can I use any knockout set with a cordless drill?
No. The listed kits use different operating methods, and the descriptions do not establish that every kit attaches to a standard cordless drill. Verify the driver, draw stud, and connection requirements for the specific set.
Does a 1-inch conduit punch make a 1-inch hole?
Not necessarily. The Growlush listing shows actual hole diameters larger than the matching conduit trade sizes. Check the die’s stated hole diameter and the fitting requirements.
Which set includes the widest listed size range?
The AMZCNC, Growlush, and UTZIKO kits list six sizes from 1/2 to 2 inches. The IBOSAD kit stops at 1-1/4 inches, and the iGeelee listing gives metric sizes.
Can these kits punch stainless steel?
Capacity depends on the specific product. AMZCNC and UTZIKO list a 1/16-inch stainless-steel limit; IBOSAD says it cannot be used for stainless steel plate. Check the individual listing before use.