The 1/2"-13 Chrome Thread-On Shift Knob Mounting Adapter is designed specifically for Eaton Fuller Style 9/10 Shifters. With its beautiful high-quality chrome plated finish and triple chrome plating process, this adapter adds a touch of elegance to your vehicle's interior. The high-quality machined 1/2 inch - 13 male threads ensure a secure fit, while the included inner base mounting screws make installation a breeze. Compatible with any same thread size United Pacific Thread-On Shift Knobs, this adapter is practical and versatile. Sold individually, it fits most Eaton Fuller Style 9/10 Shifters.