Strong Pulling Power: 4.8" Diameter Heavy Duty Rubber Suction Cup. Its Maximum Horizontal Suction Is 176 Lbs. And The Maximum Vertical Suction Is 132 Lbs. Constructed With A Quick Release Handle With A Spring Loaded Locking Handle, Easy To Re-Position. Our Suction Cups Handle Body Constructed With Aluminum Alloy, Which Has Higher Hardness And Is Not Easy To Break And Deform. The Bottom Of Suction Pads Constructed Natural Rubber, Which Wont Scratch The Paint.