4-in-1 Clamps, Medium DutyThe Strong, economical 4 IN 1 Utility Clamps adapt to serve four different applications. 1. Standard Sliding Arm Clamps are 10x faster than a C Clamp! 2. Pipe Add the exclusive V Pad to create a Pipe Clamp! 3. Spreader Reverse the clamp arm and create a Spreader Clamp. 4. Step Over Add the Extender Block to create a Step Over Clamp. Standard Pad For Light Duty clamps. Self aligning, Replaceable Heavy Duty Pad For Heavy Duty and some Medium Duty