Race Aluminum. The MOMO Race Aluminum Shift Knob: Industrial, universal fit. Machined aluminum lower half. Branded MOMO cap for a motorsport-inspired appearance. Suited to most manual and automatic transmissions. Non-threaded universal shift knob with set screws Combines style and functionality for automotive enthusiasts. Disclaimer: This is a non-threaded shift knob. The inside diameter of the hole is 14mm and 50mm deep. The shift knob is secured by 3 set screws and rubber protection covers (included in package). Fits shift knobs with a shaft diameter between 12-14mm. *By request/order.