Best 3/8-Inch Paddle Bits for Woodworking and Drilling
A 3/8-inch paddle bit is a practical choice for drilling small-diameter holes in wood. The Diablo bit is best for buyers who want a self-feeding tip and curved paddle, while the 12-inch Century Drill & Tool bit is better for reaching deeper into wood. HARFINGTON offers a single-size option, and COMOWARE provides a multi-size set for broader drilling needs.
| Product | Best For | Standout Feature |
|---|---|---|
| Diablo 3/8-Inch Spade Bit | Efficient drilling | Self-feed tip and curved paddle |
| Century Drill & Tool Lazer Spade | Long-reach drilling | 12-inch overall length |
| HARFINGTON Silver-Tone 3-Piece | Spare bits | Three 3/8-inch bits |
| HARFINGTON Gold-Tone 3-Piece | Spare bits | Quick-change hex shank |
| COMOWARE Six-Piece Set | Multiple hole sizes | Sizes from 3/8 to 1 inch |
Diablo 3/8-Inch Spade Bit
Best for: Users who prioritize drilling efficiency in wood with a standard-length bit. Its listed dimensions are 3/8-inch diameter, 6-inch length, and 1/4-inch hex shank.
The Speed-TIP self-feed design is intended to pull the bit into wood, while the curved paddle helps remove chips as it cuts. The product is described as having impact-strong construction and as suitable for corded and cordless impact drivers. These features make it a useful pick when faster hole drilling and chip evacuation are priorities.
Limitation: Its 6-inch length is shorter than the Century 12-inch option, so choose another bit if the job calls for a longer reach.
Century Drill & Tool 12-Inch Lazer Spade
Best for: Buyers who need a 3/8-inch spade bit with extra length for reaching farther into a workpiece. This model has a 12-inch overall length and a 1/4-inch power shank.
Its precision-fit tip is designed for wood boring, and the product description says it can bore accurately sized holes with less drilling pressure. The cutting edge is re-sharpenable with a common flat file, which can help extend the bit’s usable life. Choose it over a shorter bit when reach is more important than compact handling.
Limitation: The listed raker-spur feature for faster cutting and smoother holes applies to sizes 5/8 inch and larger, not this 3/8-inch size.
HARFINGTON Silver-Tone 3-Piece Set
Best for: Woodworkers who want multiple bits in one diameter for repeat jobs or as spares. The set includes three 3/8-inch bits, each listed at 5.98 inches overall, with a 2.17-inch working length and 1/4-inch hex shank.
The bits use high-carbon steel and have polished heads. Their quick-change hex shanks have grooves intended to reduce slipping and help keep the bit in place. HARFINGTON describes them for woodworking and fiberglass, and says the shank suits most brands of drill-driving tools.
Limitation: All three bits are 3/8 inch, so this set does not provide other hole diameters.
HARFINGTON Gold-Tone 3-Piece Set
Best for: Buyers seeking three same-size paddle bits with quick-change shanks. Its specifications match the silver-tone HARFINGTON set: 3/8-inch cutting size, 5.98-inch total length, 2.17-inch working length, and 1/4-inch hex shank.
High-carbon steel construction and polished heads are listed features. Grooves on the quick-change shank are designed to reduce slipping and help prevent the bit from falling off. It is described for woodworking and fiberglass, making it a straightforward option when replacement bits in the same diameter are useful.
Limitation: The listed size is 3/8 inch only; consider a range set if your projects require different hole sizes.
COMOWARE Six-Piece Spade Bit Set
Best for: People who need a 3/8-inch bit along with other common hole sizes. The six-piece set spans 3/8 to 1 inch, so it offers more size flexibility than the single-diameter HARFINGTON packs.
The set is made from carbon steel with a titanium coating. Its self-centering tip is designed to help start holes accurately, and the product description says the bits evacuate material while cutting. Listed materials include wood, fiberglass, PVC, and soft metals such as aluminum.
Limitation: The product information does not specify individual bit lengths, so check the listing if reach is a key requirement.
Buying Guide: How to Choose a 3/8-Inch Paddle Bit
What length should you choose?
Match the bit length to the material and access you need. The HARFINGTON bits are about 6 inches overall, and the Diablo is 6 inches long. The Century model is 12 inches overall for jobs where added reach matters. Overall length and working length are different measurements, so compare both when the workpiece is thick.
Is a quick-change hex shank important?
A 1/4-inch hex shank is listed on the Diablo, Century, and HARFINGTON products. The HARFINGTON shanks specifically include grooves intended to help resist slipping and keep the bit seated. Check your drill or driver’s chuck requirements before buying; the provided product details do not establish compatibility with every tool.
Should you buy one bit or a set?
Choose a single bit when you need one 3/8-inch size and want a specific feature, such as Diablo’s self-feed design or Century’s longer reach. Choose a three-piece HARFINGTON pack for multiple bits of the same diameter. The COMOWARE set is the better match when you need a variety of diameters from 3/8 to 1 inch.
What materials are listed?
Wood is the primary stated use across these products. HARFINGTON also lists fiberglass, while COMOWARE lists fiberglass, PVC, and soft metals such as aluminum. Material suitability can vary by job and tool setup, so follow the product’s instructions and use the bit only for materials specified by its manufacturer.
Frequently Asked Questions
What does a 3/8-inch paddle bit measure?
It refers to the bit’s cutting diameter: the bit is designed to bore a hole about 3/8 inch wide under appropriate conditions.
Can a 3/8-inch spade bit be used in an impact driver?
The Diablo product is described as suitable for corded and cordless impact drivers. For other models, check the tool and bit manufacturers’ instructions before use.
Which option has the longest listed length?
The Century Drill & Tool Lazer Spade has a 12-inch overall length, longer than the listed 6-inch Diablo bit and approximately 6-inch HARFINGTON bits.
Which product includes more than one hole size?
The COMOWARE six-piece set covers sizes from 3/8 inch to 1 inch. The HARFINGTON sets contain three bits in the 3/8-inch size.
Can a spade bit be sharpened?
The Century product specifically lists a re-sharpenable cutting edge that can be sharpened with a common flat file. The supplied details do not state that the other products are re-sharpenable.