1. The glass clamps are made from 304 stainless steel, which is more durability and resistance to oxidation and corrosion, rustproof, waterproof and heat-resisted, not easy to damage. 2. The flat base allows for installation onto square tubing or other flat surfaces. 3. Each glass clamps bracket comes with rubber gasket to make make sturdy and provide a solid grip on the glass. 4. These glass clamps are perfect for fixing glass of balustrade, staircase, handrail, etc. stably and safely. 5. Fit for glass thickness: 5-8mm.

http://olla.gr/3-pcs-5-8mm-flat-bottom-matte-polished-304-stainless-steel-fixed-clip-railing-glass-wood-layer-board-clamp-bracket/