https://www.woodcraft.c
Two functions in one – these roller guides will allow you to turn any workbench with bench dog holes into a convenient transfer station to easily move material from one place to another. The other function is that of a regular Bench Dog which fits standard 3/4" or 20mm bench dog holes. Make up your own finishing tables, assembly lines and more! Rollerballs have 3/4" hardened steel balls rotating on internal race. Load rating 60 lbs. per roller. Package contains four 3/4" bench dog rollerball guides.