16 commonly used sizes, including : 2x1/16",2x5/64",2x3/32",2x7/64",2x1/8",9/64",5/32",11/64",3/16",13/64",7/32",15/64",1/4",5/16",3/8",1/2".Satisfy various diy assignment, repairing demand and household improvement.

High-Speed Steel(HSS) with titanium plating provides high hardness and durability, which avoids rusting and resists abrasion.135° split point tip allows fast cutting, chips clearing and precise drilling.

21PCS Titanium impact twist drill bit set is compatible with power drill driver, impact drivers, and other power tools, easily for locking into quick change chuck.

Designed with stackable push buttons, boxes of different sizes can be firmly stacked and combined at will to facilitate carrying and storage. And the mark printed on the box is convenient to identify. You can carry or organize the drill bits easily with this case.

Suitable for wood, PVC, soft metal including copper, aluminum alloy, plasterboard, stainless steel, etc. CAN NOT used for glass, ceramic or masonry construction materials.