This is a shift knob made from a laminated wood composed of nine layers: Wenge, Beech, Zelkova, Beech, Quince, Beech, Zelkova, Beech, and Wenge, from top to bottom. The laminated wood is constructed by alternating the grain direction of each piece by 90° to enhance the beauty of the wood grain. As a result, the color appears to change depending on the viewing angle, making it look like a different object. The manufacturing process is labor-intensive and time-consuming, resulting in a slightly higher price. The finish is a natural wax finish. The thread size of the mounting part of this shift knob is 12 x 1.25mm, but it can also be installed if your thread size is 10x1.25, 10x1.5, 8x1.25, 6x1.0mm, or 12x1.75mm by using the separately sold diameter conversion adapter below. << Diameter Conversion Adapter Sizes (Sold Separately) >> ① 12x1.25mm (Knob Side) → 8x1.25mm (Lever Side) ② 12x1.25mm (Knob Side) → 10x1.5mm (Lever Side) ③ 12x1.25mm (Knob Side) → 10x1.25mm (Lever Side) ④ 12x1.25mm (Knob Side) → 6x1.0mm (Lever Side) ⑤ 12x1.25mm (Knob Side) → 12x1.75mm (Lever Side) (← This adapter is 23mm longer) 《 Delivery Method 》 Free shipping, but it will be sent via regular mail (teikeigai-yubin). 《 Other Custom Orders 》 We also accept custom orders for sizes and materials according to your preferences. Please contact us for a quote. If you are interested, please feel free to 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 comments section of this product.)