Speed Dawg Standard Thread Shift Knob Adapter Kit with 6 Sizes For use with Speed Dawg shift knobs and knobs that have a 16 millimeter x 1.50 inner diameter thread size High quality, durable product proudly made in the USA Speed Dawg fittings are made from the highest quality brass and Speed Dawg never uses plastic screws or adapters Includes 1 each: 5/16-18 adapter and jam nut, 3/8-16 adapter and jam nut, 3/8-24 adapter and jam nut, 7/16-20 adapter and jam nut, 1/2-13 adapter and jam nut, 1/2-20 adapter and jam nut Speed Dawg bang gear with shift knobs and products are widely used by numerous professional car builders and race teams