JSSEVN - Set of 4 twist drill bits for woodworking (6.4 mm, 8 mm, 9.5 mm, 12.7 mm)

【Important Notes】--- This square hole drill bit cannot be used on a general electric drill; it must be used with a square hole drill (mortise and tenon machine). Please feel free to purchase it. Or you must use the external square engraver to break with hammer blows manually.

【High-Quality Material】--- Made of high-speed steel, 56HRC hardness, long core, sharp cutting edge, continuous blade, fast cuts, high efficiency, durability and practicality, heat-treated, long service life

【Drill Bit Sizes】--- There are 4 different sizes in one set: 6.4 mm, 8 mm, 9.5 mm, 12.7 mm, they will meet your different needs

【Features】--- High-performance geometric flute design for superior chip extraction to reduce the intensity of construction workers' laboratory work, accelerate construction speed, and reduce construction costs for building, installation, renovation, and decoration industries

【Application】--- It is ideal for opening Square holes in woodworking using a mortising machine or mortar fixing. Primarily used for construction, installation, renovation, decoration, etc.