These key dust hose clamps feature a large, integral butterfly key that lets you quickly tighten or release the clamp from an industry standard 63mm dust hose without the need for a screwdriver or spanner. The steel band is coated to prevent it from rusting in the workshop and they are far easier to use than conventional clamps in the event a blockage occurs and you need quick access to the hose. Supplied as a pack of 5 these key dust hose clamps have a maximum opening capacity of 72mm. ©