Replacement part 1004683-00 — rear block / back-stop for workbench vice. Molded black plastic body with an integrated captive nut (older versions used a separate aluminium nut), designed to clamp and secure the workmate vice jaw to the frame. It installs in the rear jaw location and retaines the jaw assembly so the vice closes squarely and holds work reliably.

Fits many Black & Decker / Workmate benches — commonly listed for WM825, WM550, WM750, WM800, WM540, WM835 and WM225 (check the model type on your bench to confirm fit).

Simple, direct replacement — supplied as the single molded block assembly so you can restore proper jaw alignment and clamp function quickly.