Mishimoto's Constant Tension T - bolt Clamps are the ideal choice for clamping hoses and couplers that see a wide range of temperature and where high clamping force is needed. This 4.09in - 4.41in (104mm - 112mm) constant tension T - bolt clamps takes the superior clamping force of our traditional T - bolt clamp and adds even more reliability. A spring on the adjustment bolt allows the clamp to expand and contract with temperature swings while keeping constant pressure on the clamped parts. Like our traditional T - bolt clamps, these constant tension T - bolt clamps include a locking nut to prevent loosening under vibration.Like all Mishimoto clamps, this 4.09in - 4.41in (104mm - 112mm) constant tension T - bolt clamp is backed by our Mishimoto Lifetime Warranty.