These are wonderfully useful accessories for any bench. Wonder Dogs mount in 3/4" drilled holes to provide the moving half of a standard bench dog system without the need for a tail vise, so (together with Veritas Round Bench Dogs, #019714) they're perfect for retro-fitting into heavy benches built without dogs. They can also be used in multi-directional, multi-dog holding systems (they pivot in any direction), shop-built wooden clamps, and custom holding or shaping jigs. Dog post is 4-3/8" high. A steel spring wire keeps it from slipping. The screw angles downward 2" for secure grip. The brass clamp face is 3/4" high; the post stands a minimum of 7/8" above the bench.