CECO Chrome Spline Drive Tuner Bolt Installation Kit (20 Lug Bolts & 1 Key) 12X1.50 R.H. Thread Pitch 1.1" Thread Length 12X1.50 R.H. Chrome 60 Degree Cone Seat 1.1" Thread Length 6 Spline Dual Hex 19mm & 21mm Key These bolts have a thread length of 1.1" and are made for aftermarket cone seat wheels only, NOT for use on OEM wheels on Volkswagen, Audi or Mercedes Benz. Please verify the thread length needed and the seat on your wheels before ordering. Tuner Installation Kits should be torqued by hand only.