Tri-Groove Tamper Proof Screw and Security Nut Driver Sockets #30

Tri Groove Driver Sockets are made of Alloy Steel. The TriGroove tamper resistant fastener drive style is also referred to as: Tri-Groove, T Groove, Trident Drive and Coned Trident Drive. Security nuts are installed using a special Tri Groove socket, which grips the indentations along the outside of the fastener to turn the nut along a thread. Tri Groove nuts can only be fastened with Tri Groove Driver sockets. Fits tri-groove nut sizes 5/16, 3/8, M8