Works with Contractor Clamps (sold separately) to provide a stop for your circular saw or router when using the clamp as a guide. Plastic housing fits the T-Tracks of the Contractor Clamps and a wing nut tightens to secure the block in place at the desired position along the clamp.
From the Manufacturer
The E. Emerson Tool Co. Contractor Stop Block has a L-bolt that slides into either track on the E. Emerson Tool Co. All-In-One Contractor Straight Edge Clamping Tool Guide. The large wing nut on top locks the block into position. Additional micro adjustments can be made with the multi position bolt and lock nut. Use the stop block to terminate cuts or as a positioning stop when using your clamp as a fence for your drill press.