Tempra Anti-Theft hub nuts, for track hubs. These nuts replace your standard track hub outer nuts, and includes a special TEMPRA tool which replaces the standard 15mm wrench you would normally use to fit or remove your wheel. Too many of us have experienced a front or rear wheel being stolen, and when you are using high quality wheels from Shimano, Araya, H Plus Son etc...you can't afford to have that happen! These track hub nuts fit hubs from Shimano, Suntour, Sansin, Gran Compe etc.. They will not fit Campagnolo pista or Phil Wood hubs, and will not fit Aerospokes. We do not have experience fitting them to Mavic Ellipses but we suspect they may not fit. Available as a set, front and rear, in either black or chrome color. The price includes the set: FRONT and REAR, plus the special tool. Front are 9mm diameter thread, and rear is 10mm diameter thread. MADE IN JAPAN.