CECO Black Spline Drive Tuner Bolt Installation Kit (20 Lug Bolts & 1 Key) 12X1.25 R.H. Thread Pitch 1.1" Thread Length 12X1.25 R.H. Black 60 Degree Cone Seat 1.1" Thread Length 6 Spline Dual Hex 19mm & 21mm Key **For use only on Cone Seat Wheels**