Zinc and blue-passivated and case-hardened. For use with high density fibre boards. Tri-Lock threadform and shank incorporate the benefits of a single coarse thread with a twin thread start. Spiral point, part thread and under-head ribs for self-countersinking....

Floor-tite Zinc-plated Case hardened Screws (Dia)4.2mm (L)55mm Pack of 200.This pack of Prodrive recess countersunk head flooring screws are constructed from a durable case hardened 55mm in length and come partially threaded. They have tri-lock threadform...

Zinc and blue-passivated and case-hardened. Tri-Lock threadform and shank incorporate the benefits of a single coarse thread with a twin thread start. Spiral point, part thread and under-head ribs for self-countersinking. Flush, neat fix will not work...