V-Blocks and Clamp Set, 1-1/4" (32mm) Capacity. Starrett V-Blocks come in a variety of styles to suit the numerous requirements of machinists. They are for general shop use and layout work, as well as for holding stock in place during light-duty milling, drilling, and grinding operations. All clamp screws have a hole to help secure the workpiece. V-Blocks (Pair) and Clamp Set.