Lisle 44480 Large Hose Clamp Vise Tools are used to relieve clamp spring pressure in very tight spots Tighten knurled knob by hand or use 1/4" drive ratchet Compact design works great in confined spaces Ramp on jaws guides tab of clamp into correct position and traps it in the slot for safety Vise is often left in place, with the clamp compressed, during service