Will not mark or scratch expensive or delicate firearm parts, but holds them firmly without damage. Durable, nylon-reinforced rubber is permanently bonded to lightweight aluminum, replaceable jaws. Wide retaining lip with nitrile magnet on the underside keeps jaws in place; drops right onto any 4', 5' or 6' steel bench vise and stays put. SPECS: Aluminum jaws, rubber face. 4' (10cm) long, 3/8'
(9.5mm) thick, 1ј' (3.8cm) wide face.