I nstruction This vise is an economical choice that fits the need of many engravers and craftsmen. With a double-ball bearing system for smooth rotation without wear or looseness, the Standard Block combines outstanding quality with value for work holding. Control the rotational resistance with an integrated rotational brake system. It includes 2 upper jaw plates, 32 piece attachments kit, 1 screw driver, 2 Thermo-Loc sticks, 2 jaws. With a variety of pins that fit the upper jaw plates of every Block, you can now instantly solve work holding problems and start working sooner.