This is a shift knob made from laminated wood, created by layering multiple thin sheets of walnut with different color tones. The laminated wood is constructed by alternating the grain direction of each sheet by 90° to enhance the beauty of the wood grain. It is also strong and less prone to cracking than solid wood. Due to the labor-intensive production process, the price is set a bit higher. The finish is a natural wax. The thread size of the mounting part of this shift knob is the versatile 12 x 1.25mm. For vehicles with thread sizes of 10x1.25, 10x1.5, 8x1.25, 6x1.0mm, and 12x1.75mm, installation is possible by using the separately sold diameter conversion adapter below. << Diameter Conversion Adapter Sizes (Sold Separately) >> ① 12x1.25mm (knob side) → 10x1.25mm (lever side) ② 12x1.25mm (knob side) → 10x1.5mm (lever side) ③ 12x1.25mm (knob side) → 8x1.25mm (lever side) ④ 12x1.25mm (knob side) → 6x1.0mm (lever side) ⑤ 12x1.25mm (knob side) → 12x1.75mm (lever side) (←This adapter will be 23mm longer) 《 Delivery Method 》 Free shipping, but it will be sent via regular mail (teikeigai). 《 For Other Sizes and Materials 》 We also offer custom-made products to match your desired thread size, material, and dimensions. If you are interested, please contact us through the inquiry form on the "Wood Workshop Craft Miya" website. (Please note that we do not allow communication about other products in the comment section.)