IRWIN 3053058 Insert Bit, T45 Drive, Torx Drive, 5/16 in Shank, Hex Shank, S2 Steel

Tamper resistant Torx screws feature a post in the center of the recess; this post will only fit into a tamper resistant Torx bit. Used in applications such as control panels, display cases, high-tech equipment, security; 1/4" hex shank.