Energetic Armament VOX BLOX, 1.74 Diameter, Soft Jaw Tool for Clamping Suppressors, High Density Plastic EA42 The Vox Blox is a unique soft-jaw tool for clamping silencers in a vise when working on them. The Vox Blox is made of high density polyethylene plastic to minimize the chances of marring the silencer finish while providing a secure grip. The Vox Blox is available in several sizes to fit different silencer outer diameters.