Our heavy-duty clamp has a spring-loaded mechanism that prevents the post from slipping or dropping. This smart system allows one-hand height adjustment while holding the animal with the other. The post is fabricated of heavy-duty 1" square, 14 gauge stainless steel tubing. It Adjusts in height from 12" to 40". It Accommodates table tops up to 1 ¼” thick. Stainless steel protection plate included to protect underside wood integrity.