BOLT Down Vertical Clamp with 0 – 16 inch clamping envelope and 4-1/2″ throat. Bolt Down Boot securely bolts this clamp to a Weldsale Platen. (will ONLY bolt to used WELDSALE Platens, NOT Generic Used Platens.) Some customers prefer this Clamp. It is very much like our popular WS16-134-20, except for the bolt down feature and clamping envelope. Positives features are that this will securely bolt down and vertical arm does not tilt back. Negative features are that it is slower to install and remove on the Platen, and swivel feature – the ability of clamp to swivel out of the way after unclamping – is negated by this Clamp bolting down.