Silverhill Tools ATK67 6 Point Star Security Bit Set with Security Bits (Torx TR Style with Pin In Hole) for Screwdriver Handle for 1/4 Inch Bits. Tool Sizes T4 T5 T6 T7 T8 T9 T10 T15 T20 T25)

Bit set comes complete with the most common sizes: T4 T5 T6 T7 T8 T9 T10 T15 T20 T25. Sizes T4 T5 and T6 are too small for us to put a hole in the tip so only the larger sizes are tamper resistant. Sizes T7 T8 T9 T10 T15 T20 T25 are Tamper Resistant meaning that they have a hole in the tip to bypass the post that is found in some security screws. But even the tamper resistant bits can be used on regular screws. Made from High Quality CRV6150 steel these will resist stripping and deforming more than lower quality Heated Treated or Carbon steel. Please make sure you use the correct size as using the wrong size increases the chances of stripping significantly.