Features: High Quality Rubber with Captive Brass Nut,resistant to vibration and corrosion.Flange holds fixing flush to mounting surface.Sleeve compresses to provide secure fixing, even in irregular shaped holes. Just thread the screw into the well nut expandable insert to secure it in place. Commonly used to secure motorcycle fairings parts, body parts, fenders,bumpers and some windscreens. Vibration and shock resistant - dampens noise. Can be used in blind holes and tubes. Specifications: Material:Rubber Type:M4(diameter:11mm/0.43in),M5(diameter:12mm/0.47in),M5(diameter:13mm/0.51in) Quantity:10Pcs Net Weight:20g Note: Please allow 1mm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 10x Motorcycle Windshield Wellnut