[Material]:Our flat washer is made of iron material,cold and heat resistant,lightweight [Feature]:Round foam board washers with high bearing capacity,good shock absorption effect,not easy to deform,good insulation [Multifunctional]:The flat washers are not just spread the load and prevent damage to wall ceiling insulation board,foam panels,or sheets during installation,but also have a function on fix and fasten the screws through its center hole [Application]:Flat Washers is suitable for foam board,expanded polystyrene board,extruded polystyrene,foam insulation board,gypsum board [Package Content]:You will receive 200pcs flat washers for screws and nails,enough for your daily use, Weight: 0.86421206704 Pounds, Manufacturer: PIXZCSA