This product is made with premium quality brass and rubber sleeve, an ideal accessory for your kayak, canoe, boat. Features: 10PCS, 20PCS, 50PCS, 100PCS, various kinds of quantity for your choice. Nuts are made of brass and rubber, the perfect accessory for your kayak, canoe, boat. Easy to use, suitable for personal or professional use. Tightening a threaded screw into the brass nut expands the insert to secure the fastener. Specifications: Item Type: Rubber Nuts Material: Rubber+Brass Quantity: 10PCS, 20PCS, 50PCS, 100PCS (optional) Size: M5 Package Weight: 10PCS: 18g / 0.63ounces 20pcs: 36g / 1.26ounces 50PCS: 90g / 3.17ounces 100 PCS: 180g / 6.34ounces Package size: 10PCS: 1004020mm/3.931.570.78in 20PCS: 18012020mm/7.08