Description of π οΈ Top-notch Drilling Combo: Deburr & Countersink by Bestgle
High-speed steel material, 1/4"(6.35mm) Hex Shank, Imperial Size BSW1/8, BSW5/32, BSW 3/16, BSW1/4, BSW5/16, BSW3/8. Back tapered beyond tap to prevent thread damage from over-drilling, suitable for drilling and tapping, use it on the tapping machine. Self-Centering point, complete hole drilling, tapping, deburring and counter sinking in one operation, do not need assistant center drilling or center punching. Suitable for tapping on wood or other soft metal,such as aluminum plate, iron etc(thickness of less than 3mm), but not for stainless steel. Please Note: Pay attention to the operation method when using the hand drill; Excessive sloshing and tilting will affect tapping and even break the tap.