You are buying a pack of 10 4mm threaded connecting screws / interscrews male / female screws male screw - zinc plated pan head , 4mm x 20mm , zinc plated (please note that some of these may be tarnished female screw - nickel plated , 4mm thread maximum connecting thickness - 40mm this can be made as short as 27mm by cutting the screw down 5mm hole to be drilled to accommodate the female screw |