Rockwell Jawhorse Plywood Jaw Accessory (RK9206). Expands to hold 48” plywood. Unboxed but never used. Support structure brackets and user manual included. The user manual explains how to use the support structure brackets and 2x4s to create a support structure for large sheets of plywood or drywall.This is an accessory for a Rockwell Jawhorse. A Rockwell Jawhorse is not included. This item is also listed on Craigslist-Chicago