These compact, lightweight fence clamps allow you to secure a wide variety of shop-made auxiliary fences to your existing fences without the clamp getting in the way. The clamp arm simply fits into a 3/8″ hole in the top of the auxiliary fence, preventing interference while you work. Clamps can be used in pairs for sacrificial fences, half-fences, resew fences, singly as Stop blocks and many more fixtures. Includes 2 clamps, which is all you will need! Material: Aluminum and steel