This vise screw is for the L-shaped shoulder vise used on Scandinavian-style benches. 1 1/8" dia. screw with single-lead Acme threads.
The threaded guide is mortised into the vise shoulder, while the end guide attaches to the vise jaw. 7 1/4" clamping capacity (less wooden shoulder thickness), 13" overall. Mounting screws included.