Fits 3/8 Holes in Auxiliary Fences. Range of travel 1/2? -5-3/4? (12mm to 146mm). Non-Marring Clamp Pad Protects work. Use with 90° clamping squares for easy corners. Allow you to secure a wide variety of shop-made auxiliary fences to your existing fences without the Clamp getting in the way. These compact, lightweight FenceClamps 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, re-saw fences, singly as stop blocks and many more fixtures. Also great when used with clamping squares for framing projects. Includes 4 fence clamps.