"This Wilton Pow-R-Arm features the full swiveling, 360 dead-lock work positioning. It puts the workpiece where you want it and holds it tight for handsfree production. U.S.A. Clamp Type 360 swiveling workpiece positioning, Pieces qty. 1. Fast on-off action with horizontal-moving locking handle Body is cast aluminum with steel parts 3in. diameter mounting pad with two 1/4-20 holes 180 apart 4 slotted equally spaced 9/32in. diameter mounting holes Available in a wide range of models for every job size, Pow-R-Arms are perfect for any application at a permanent workstation, assembly line or workbench Reposition the workpiece quickly and accurately with the flexibility of Pow-R-Arms wrist action, eliminating time-consuming clamping and unclamping Pow-R-Arms increase productivity by bringing the work to the worker, which helps reduce fatigue, back injury and other health problems"