This adapter kit enables you to put a 16mm x 1.50 threaded Speed Dawg shift knob on a non-threaded shifter. Black finish with 3 small set screws and 3 large set screws. Inside diameter is 5/8". Includes 3 rubber sleeves with inside diameters of 9/16", 1/2", and 3/8". This is the correct adapter for the Jeep Wrangler (2007 and newer manual) and the Ford F150.