Lisle 44500 Small Hose Clamp Vise Tool is used to relieve clamp spring pressure in very tight spots Vise is often left in place, with the clamp compressed, during service Ramp on jaws guides tab of clamp into correct position and traps it in the slot for safety Ramp on jaws guides tab of clamp into correct position and traps it in the slot for safety. Tighten knurled knob by hand or use 1/4" drive ratchet The small size works especially well on heater hose clamps