Kei Project Metric Thread Stainless Steel Shift Knob Shifter Manual Stick Adapter Insert Kit 12x1.25 to 10x1.25 Lock Nut Included 12mm x 1.25 thread to 10mm x 1.25 threaded adapter Stainless Steel Lock Nut Included Material: Stainless Stain Smooth and clean threads provides effortless installation. M10x1.25 inner thread