Truss/Button Head Machine Screw with Zinc Plating and Length Ranging from 13 to 300mm Head type: CSK/flat head, truss head, trumpet ... 300mmHead recess: Philips 4 Ribbs, Pozi, Philips, Square, H.W.F undercut, H.W.H, serration, flower head and othersPlating: plain ... , and we also pass the BV inspection Truss/Button Head Machine Screw