These Adjustable Glass Clamps are fabricated from die cast metal. The Glass Clamps are an easy and secure way to create privacy dividers with 3/16 to 3/8 inch (5 to 10 millimeter) thick glass. They have a satin chrome finish and rubber O-rings for a solid grip on the glass. Easily installed and attached by tightening the two large screws snugly against the glass, then tighten the set screw to apply the clamping action.