Timco's heavy section self-drilling screws are designed for heavy section 12mm steel, with a fine self-tapping metric thread. They are plated with Silver Ruspert which is a reliable coating able to withstand over 1000 hours of salt spray testing. Specifically designed and manufactured to meet all the recognised industry standards and performance criteria. Hex head with a self-drilling tip Silver Ruspert plated for a durable corrosion resistant coating which can withstand over 1000 hours of salt-spray testing Designed for heavy sectional work Self-drilling screws for heavy section 12mm steel, with a fine self-tapping metric thread. Size - 5.5 x 65mm (16mm Washer) Quantity - 100 KINDLY REMINDER: Delivery to the UK Highlands, Channel Islands, Northern Ireland, Isle Of Wight, Isle Of Man and the following postal code areas: BT, FK, KA (1-30), PA(1-49), PA(60-78),PA80, PH, PH(11-40), PH(41-44), PH(49-50), AB, IV, KW, ZE, GY(1-10), JE(1-5), PO(30-41), IM, IR, HS are excluded from our standard delivery charge and may incur extra costs.