Bonded washers designed specifically for tek screws, combining a rubber or neoprene washer permanently bonded to a metal washer. These washers create a watertight seal, preventing water ingress and corrosion around fastener holes. Ideal for roofing, cladding, and outdoor applications where weather resistance is essential. The bonded construction ensures the washer stays in place during installation, reducing assembly time and improving reliability. Compatible with standard tek screw sizes for metal and timber substrates.