Hollywoodwinds sax. key clamps are specially designed to prevent your saxophone pads from developing leaks. All sax pads swell and contract with changes in moisture and temperature.. warping the pads, and causing them to leak. Hollywoodwinds key clamps help prevent the leaks by allowing your pads to dry seated in the proper position on their tone holes, extending the life of your pads. HollywoodWinds Key Clamp not only prevent leaks, but protect your delicate keywork from damage.