Installation screw 4020210 with insulated cup washer and cross-slotted head with Phillips PH2 recess Dimensions 5 x 32 mm (set of 100) Sharp point, fully threaded High pitch for quick mounting Provided with a transparent cup washer for screw head protection To be used when installing single insulated wire in for instance trunking Material: Hardened steel, electroplated, and PP Works in many different materials, such as wood, plasterboard, concrete, bricks (pre-drill a 4 mm diameter hole), sheet metal studwork