CRL Polished Nickel Square 135 Degree Glass-to-Glass Clamp. CRL Square 135 Glass-to-Glass Clamps have sharp corners. The glass can be mitered or flat edged. Clamp is designed to clamp 5/16 to 1/2 (8 to 12 mm) glass panels. They secure two glass panels meeting at a 135 degree angle. These Clamps have many uses, and are typically utilized in the fabrication of custom showcase displays, trophy cases, partitions, and all-glass enclosures. Available in a variety of popular finishes and styles to match designer hardware. Made of solid brass, these Clamps are engineered to remain beautiful for years with proper care and cleaning. Drawings and templates are available.