5pcs Torx T40 T45 T50 T55 T60 Screwdriver Bit Set Extra Big 5/16 Inch Shank Screw Driver Bits For Repair Hand Tool Star Bit Kit Specification: Material:chrome vanadium steel Shank:5/16 inch Bit type:T40 T45 T50 T55 T60 Feature: Using the advanced alloy steel, the overall induction hardening, no