1Automatic Bottle Hat Tightener: Ensures quick and effortless tightening of bottle hats with a lock buckle mechanism, suitable for hats with a diameter of 80 to 90mm. 2Waterproof and Leakproof Design: Special rubber pad inside the bottle capper bit for secure sealing to prevent water leakage, ideal for industries such as food, beverage, cosmetics, and pharmaceuticals. 3Versatile Compatibility: This capping machine bit can be used with a variety of electric drills, pneumatic drills, and 6.35mm bit air screwdriver for efficient hat tightening operation. 4Improved Efficiency: Use this electric capping machine bit to enhances production efficiency and reduces labor strength for operators in the food, beverage, cosmetics, and pharmaceutical industries. 5Robust Structure: Made of metal and rubber, this hat tightener is robust and sturdy for a long service life, making it an ideal replacement for the old or damaged parts. 1 xElectricCappingMachineBit