Material: Premium Aluminum Alloy for exceptional durability. Weight: Ultra-light at 0.04 lb (0.69 oz / 19.5 g) Specification: 12mm to 9mm Thru Axle Hub quick release, Suitable for 100mm fork spacing. Easy to Install: With a perfect fit, lightweight design, and durable construction, BIKQQUR bike thru axle adapter ensures quick and easy installation, effortlessly enhancing your riding experience. Thru Axle Package: Bicycle QR Adapter Thru Axle x1,( Includes two shock-absorbing rubber rings ) Bike Hubs Thru Axle Adapter Mountain and Road Bike Thru Axle Quick Release 100mm Spacing (12mm to 9mm/ 15mm to 9mm/ 15mm to 12mm)