MAX Keyed spline drive racing nuts are made from steel, CNC machined. BLACK CHROME plated finish. 12x1.50 thread (Toyota, Mazda, Hyundai) Now you can have the form and function of the racing nuts your car deserves without allowing anyone with a socket wrench to jack your wheels. Sold in a set of 20 & one key is included. Ends are threaded to accept colored caps which may interfere with extra long studs.