Item Type: Mid lock hub to 6 pin disc adapter Material: Aluminum alloy Gross Weight: 32g / 1.1oz Color: Black Application: Central lock adapter for mounting 6 hole brake discs on the central lock hub. Compatible with 9mm 12mm 15mm hub axles.Package List 1 x Bike Hub Center Lock To 6 Hole Adapter1 x Lock Cover1Durable Material: Center lock disc to 6 pin disc adapter is made of premium aluminum alloy material, which is strong, wear resistant, not easy to break, long service life. 2Ergonomically Designed: The bike center lock adapter is ergonomically designed, easy to install and easy to disassemble, providing you with a more comfortable experience. 3Prevent Damage: CNC machining make the cover of the bike center lock adapter smoother, and it can prevent scuffs and damage. 4Scope of Application: Central lock adapter for mounting 6 hole brake discs on the central lock hub. Compatible with 9mm 12mm 15mm hub axles. 5Easy to Install and Remove: Center lock to 6 hole adapter is suitable for mountain bikes, easy to install and remove. It is a very practical bike accessory.