Features
This 37pcs star driver bit set for Impact Driver, made of S2 alloy steel ,with sturdy hardened and tempered construction. Increase bit power and reduce fracture.Manganese Phosphate surface to prevent rust.10 times life expectancy versus standard bit

Strengthened magnetic impact torx bits helps you easy pick up screws. The magnetism doesn't decay after multiple uses,no damage to the screw and screwdriver head. (The 1” bits are not magnetic by themselves but only when connected with the magnetic bit bolder)
1/4" hex Shank can be used with electric screwdrivers, hand screwdrivers, electric drills, combination general purpose tools and any standard drill.
Widely used in automobiles, repairs, trucks, automobiles, engines, motorcycles, interiors, dashboards, computers, cable boxes, toys, woodworking and other screw driving applications.
Specifications

12PCS 1 inch Tamper Resistant star bits T5, T6, T7, T8, T9, T10, T15, T20, T25, T27, T30, T40 (T5 and T6 are not tamper proof security bits).

12PCS 1 inch are most commonly used，include T15,T20,T25,T30,each one 3pcs.
12PCS 2.3/8 inch Tamper Resistant star bits, T5, T6, T7, T8, T9, T10, T15, T20, T25, T27, T30, T40(T5 and T6 are not tamper proof security bits).
1PCS 2.3/8 inch magnetic bit bolder
1PCS Storage case