The material of shift knob extender is aluminum that can reduce friction and make shifting even smoother. The offset elbow of the shifter can be rotated to several different positions. This shift knob extender is highly adjustable, shifter height is adjustable. Gear shifter (adapter) Thread specifications: M8*1.25, M10*1.25, M10*1.5. Thread specifications: M8 * 1.25, M10 * 1.25, M10 * 1.5, M12 * 1.25.