Features: Made of premium aluminium alloy and stainless steel material,high strength,anti-rust and durable. Converts your hubs to fit 6 bolt discs. No need any bolts/screws to lock rotors anymore. Compatible with 9mm / 12mm / 15mm hub axis. Specification: Color: Black / Blue / Gold / Red (optional) Material: Aluminum Alloy + Stainless Steel Adapter size: 54 * 10 mm Adapter cap size: 44.7 *9.3 mm Washer size: 42 * 0.1 mm Total weight: Approx. 31.8 g / 1.1 oz Package weight: 33.8 g / 1.2 oz Package List: 1* Adapter 1* Adapter Cap 1* Stainless Steel Washer