Shift knob designed for smooth and seamless gear changes. Steel construction for added weight and easier shifts. 12.8 oz/360 gram total weight for precise and accurate shift feel. Ergonomic shape allows for smooth shifting and comfortable hand position. Purchase includes three insert sizes to fit various applications. Insert thread pitch sizes: M8 x 1.25, M10 x 1.5, M12 x 1.25. Mishimoto Lifetime Warranty.