CECO Black Duplex Spline Drive Tuner Installation Kit (20 Lug Nuts & 1 Key) 9/16" R.H. Thread Pitch 9/16" R.H. 1.9" Overall Length 60 Degree Cone Seat 7 Spline Dual Hex 13/16" & 7/8" Key Tuner Style Lug Nuts are designed to fit small diameter recesses in Aftermarket Alloy Tuner Wheels that require a cone seat fitment. This type of lug nut has a 60 taper and should be torqued by hand only.