Gates revolutionary PowerGrip clamps are truly a unique companion to Gates Performance coolant hose. Just apply heat and the clamp shrinks, applying a constant tension and eliminating cold water leaks - even for out-of-round fittings or steel-braided hose. Best of all, they look great - clean and sleek, and superior performance. Available for coolant hoses 3/8 inch I.D. through 3 1/8 I.D.