1. Material: CNC 7075 aluminum alloy 2. M18: for Prowheel hollow one-piece discs, FS.A discs and the old FC-4500 and FC-5600 road discs and other road and mountain bikes 3. M20: for Shimano kit, M400/M590/M596/M661/SLX/XT/XTR and other one-piece discs for road and mountain bikes 4. Aluminum alloy material, CNC cutting, durable and wear-resistant, not easy to damage 5. Lightweight design, compatible with strength and lightweight, make riding easier 6. Standard tooth pattern, will not cause different thickness, tight fit 7. Simple installation, easy to use 8. Diameter: - M18: cap 28mm; screw 18mm - M20: cap 28mm; screw 20mm 9. Weight: - M18: 7.8g - M20: 9.3g
