Wider Jaws provide greater clamping surface. Fully enclosed spindle and nut increases the life of the vise. Large anvil work surface. Precision turned sidebar. 360 swivel base with double lockdowns Proudly made in the USA, the Tradesman round channel vise is designed to handle the most demanding clamping applications. Unlike most vises that have a fixed center nut, the Tradesman round channel vise nut is anchored at the rear. This rear anchored nut provides straight line pull and even pressure resulting in greater durability. The round channel design also allows for a completely enclosed spindle and nut assembly. This enclosure keeps debris out and lubrication in for a lifetime of smooth operation. For ultimate versatility, the Tradesman is equipped with main jaws, pipe jaws and a machined anvil work surface. The main jaws are serrated for a sure grip. The pipe jaws are grooved to prevent rotation of round stock and have a two step design to assure a firm hold on both large and small diameter material. Both the main jaws and the pipe jaws are fully replaceable. The Tradesman vise is also equipped with a swivel base with dual locking nuts. The open locking design of the Tradesman base allows for a full 360 degrees of rotation. To prevent rotation during use both the locking nuts and base have serrated edges that interact positively to assure a non-slip grip when tightened. The main base has four pre-cast holes for mounting the vise to a work surface. Each vise includes a mounting template for quick no guess hole placement for mounting.