The new Veritas Surface Clamp ($59.50) provides a way to secure a workpiece almost anywhere that you can drill a 3/4-in.-dia. hole. It even works on vertical surfaces. Most bench clamps require through holes. This Veritas clamp also anchors in blind holes, as long as they're at least 5/8-in.-deep. The locking mechanism is based on sliding wedges that expand as you tighten the brass knob on top of the clamp. The clamp arm tilts on the post to adjust up and down. The arm engages at 90-degree positions and locks securely in place. Maximum thickness capacity is 3-3/4-in. Throat capacity is 2-1/8-in.
Source
Lee Valley &?Veritas, (800) 871-8158, www.leevalley.com, Veritas Surface Clamp, #05G19.01, $59.50