Square Hole Mortise Chisel Drill Bit Tools, Woodworking Hole Saw Mortising Chisel Drill Bit Set Twist Drill, Different Sizes 1/4″ 5/16″ 3/8″ 1/2″ (4pcs)

-Size: 6.35mm (1/4″), 7.94mm (5/16″), 9.5mm (3/8″), 12.7(1/2″)mm
-The dimension refers to the length of the square hole drilled by the square hole.
-The cylinder diameter of the clamped portion is 19mm/0.74inch.
-The square hole drilling core we sell are about 210mm, belong to longer drilling core.
-Material: Made of high speed steel, through heat processing, with high hardness drill bits, and sharp-edged square chisel, long life

Application: Used for woodworking punching

High working efficiency


With long drill core and square chisel, easy to lock the hole on the wood, then you can get different mortisers quickly. Also, it is labor saving.

Package Includes:
1 X 6.35mm (1/4″) Twist Drill
1 X 7.94mm (5/16″) Twist Drill
1 X 9.5mm (3/8″) Twist Drill
1 X 12.7mm (1/2″) Twist Drill
Package Dimensions ‏ : ‎ 9.06 x 5.2 x 1.54 inches; 1.69 Pounds
Item model number ‏ : ‎ GB-9652
Date First Available ‏ : ‎ March 24, 2022
Manufacturer ‏ : ‎ Ziosxin
ASIN ‏ : ‎ B09WDQT2FB
Country of Origin ‏ : ‎ China

This square hole drill bit is great for drilling square holes in wood with a mortising machine or a mortising attachment.
This mortising chisel fits all mortising machines and drill press attachments 6.4mm (1/4″), 8mm (5/16″), 9.5mm (3/8″), 12.7mm(1/2″) sizes
The drill bits for square holes with high performance flute design geometry for superior chip extraction
Made of the highest quality tool steel Hardness: HRC 48~50
Used with mortising chisel , if extend square hole manually, need to use electric drill, hammer and other tools.