[Specifications and packaging]: 30Piece hex shank twist drill bit set,include size: 29pcs hex twist drill 1/16″, 5/64″, 3/32″, 7/64″, 1/8″, 9/64″, 5/32″, 11/64″, 3/16″, 13/64″, 7/32″, 15/64″, 1/4″, 17/64″, 9/32″, 19/64″, 5/16″, 21/64″, 11/32″, 23/64″, 3/8″, 25/64″, 13/32″, 27/64″, 7/16″, 29/64″, 15/32″, 31/64″, 1/2″ and 1pc 60 (L)quick change bits holder all in BMC.
[Fitment]:Metal drill bit set for metal/wood/plastic sink. Suitable for Home DIY, and General Building/Engineering Use.Metal(steel plate, aluminum plate, iron plate), wood, plastic, PVC (not applicable to wall).
[Material]：Imapct twist drill bits are made of high speed steel and titanium coated. The classic high speed steel construction is coated with titanium to increase toughness and durability.
[Advantages] : The 135-degree double back angle and twist design of the hss drill bits increase the cutting speed, and is easy to automatically centering to prevent movement. The blade has undergone high temperature heat treatment and clear edge treatment to ensure sharpness; Vibration-free design, zigzag, ensures accurate counter hole and hole cleaning. Quickly remove them and leave clean, smooth holes.
[Quick Replacement, Safe Installation]：Titanium drill bits 1/4 inch hex shank fits into all power tools more easily and securely, specially for locking into quick change chuck. We also offer a quick-change adapter to better quick change.