Stops frame crush while performing any of the lapping, heavy hammering or heating and bending alterations that require holding and squeezing the frame in a bench vise. Expandable Magazine Well Support adjusts to fill magazine opening so it can't collapse. Hardened steel Side Plates index off the grip bushings to take vise jaw pressure and dings, plus provide a convenient, damage-proof, straight edge guide for stippling on the front strap. Fits all types and calibers of 1911 Auto frames. Mfg: Power Custom SPECS: Heat-treated steel, blued finish. Mag Well Support - 4'''' (10cm) long, adjusts to 1-3/8'''' (3.5cm) wide. Side Plates - 3 '''' (7.62cm) wide, 4A 1/2'''' (11.4cm) long, A 1/4'''' (6.3mm) thick. Includes Allen wrenches, adjustment screws and instructions.