"The Wilton Serrated Machinist Bench Vise is designed to handle the most demanding clamping applications. Unlike most vises that have a fixed center nut, the Machinist round channel vise nut is anchored at the rear, which provides straight line pull and even pressure resulting in greater durability. Round channel design also allows for a completely enclosed spindle and nut assembly that keeps debris out and lubrication in for a lifetime of smooth operation. Vise is equipped with high-strength steel replaceable main jaws and a machined anvil work surface. Also features a swivel base with dual locking nuts that allows for a full 360 of rotation. Both the locking nuts and base have serrated edges that interact positively to assure a nonslip grip when tightened. Main base has four precast holes for mounting the vise to a work surface. A mounting template is included for quick no-guess hole placement for mounting. Jaw Capacity in. 5 1/4, 360 Swivel Base Yes, Jaw Width in. 3 1/2, Replaceable Jaw Yes, serrated, Jaw Depth in. 3/4, Double Lock-Downs Yes, Pipe Jaw No. Hardened steel jaw has replaceable inserts that are machine serrated for safe, sure grip under maximum torque Extra deep throat gives you more working room where it counts Enclosed design keeps lubrication in and contaminants out for smooth operation Large anvil work surface Locking swivel base with 360 rotation is enhanced by serrated swivel base with double lockdowns for nonslip holding Four mounting posts"