This set of high quality solid steel Plug Vises are adaptable for plugs from .480” dia. to .550” dia. These vises can be hand held or held in a bench vise. Only two vises are needed. Your loaded plugs will rotate in the vises in the same manner as in the cylinder shell. The vise can be adjusted to any tension. The key blank will not drop below the radius of the plug so the shear line can be maintained. High pins will show up when the plug is rotated in the vise. Made from solid steel for durability with the usual Framon precision.