Ti-Master Titanium Centerlock Rotor Lock Rings, internal & external spline version. Made with specially heat-treated Titanium alloy, formed with precision CNC-machining that Ti-Master is famous for. Comes in at ~5.9g (inner) and ~6.9g (outer spline) each, a fraction of stock rotor lock rings. ----------------------------Compatibility Suitable for inner spline/lock rings or outer spline/lock. Please select the option carefully. Required Tool Inner Spline: Shimano Cassette Tool Outer Spline: Shimano/Park Tool BB Tool For Shimano / DT Swiss / SRAM Centerline Road Disc & MTB Centerlock Brake Rotors ----------------------------Specifications Approximately ~5.9g (inner)/6.9g (outer) per piece. 28% lighter than Carbon-Ti Lockring. Torque to 40Nm ----------------------------What's in the box? - Item is sold per set (Front and rear). To change the front and rear rotor lock ring, please purchase 1set. ----------------------------Links For other Ti-Master Titanium Upgrades: Click Here! For other rotors or rotor lock rings, Click Here!