Sjobergs-ST03-Holdfast-Clamps-for-Workbenches-Sjobergs-33637-P-These-ST03-holdfasts-can-be-located-in-any-of-the-dog-holes-in-the-worktop-or-front-legs-of-the-range-of-Sjobergs-workbenches-P-P-They-are-inserted-into-a-dog-hole-then-tightened-on-to-the-workpiece-by-twisting-the-handle-The-ridged-shaft-of-the-holdfast-locks-securely-into-the-dog-hole-to-prevent-lifting-P-Sjobergs-33637-ST03-Holdfast-Twinpack-