Nut for tightening the Centerlock brake disc. Compatible with 12 mm, 15 mm, 20 mm and QR fixed axes. They are available in eight colors to match other anodized colored Wolf Tooth components such as replacement bolts, seatpost sleeves, stem pads and more. Centerlock Rotor Lockrings are made from 7075-T6 aluminum and machined at Wolf Tooth in Minnesota, USA. Sold in one piece. Weight: 10.5g