CONCRETE SCREW, also called as window frame screw.
Material: 1022 steel
Size: 7.5mm diameter
Length: from 42mm to 212mm.
Processing: case harden on the surface.
Finish: zinc plated yellow or white.
Head type:Torx-30 Countersunk
Packing: small box by 100 pcs then into cartons and pallet
Supply ability per month: 200 tons.