High Compatibility: Compatible with a wide range of vertical knee-type mills with a 5/8" end shaft diameter, including Bridgeport, Precision Matthews, Enco, Jet, Sharp, Acer, Webb, and more. Infinitely Adjustable Speed Knob: Max torque of 450 in-lb and a maximum speed of 200 RPM, with feed and return speeds of 965 mm/min and 1385 mm/min respectively. The speed can be smoothly adjusted between these limits using the knob, ensuring efficient and precise milling. Secure and Efficient: Equipped with Gleason spiral bevel gears for stable operation and efficient power transmission. In case of tool collisions or sudden reversals, the system automatically engages protective measures to safeguard the equipment and maintain stable operation. Simple and Easy to Use: Features both manual and automatic speed adjustment modes, allowing for easy switching to control the feed speed as needed. Installation is simple and can be completed in a short time without professional skills. Compatible with Milling Machines: Specifically designed for mills with a 5/8" shaft diameter, providing precise operation in the Z-axis direction. It is compatible with mills of the same shaft diameter, easily handling various industrial machining tasks such as milling and boring.