CRL Roll Formed Cap Rails offer a less expensive alternative over our Premium Cap Rails, but still maintain the look and performance required in a glass railing system. Roll Formed Corners, Connector Sleeves, and End Caps are available. The 1-7/8" (48.3 mm) diameter Cap Rails can be used with 1/2" (12 mm) and 5/8" (16 mm) tempered monolithic glass, and 13.52 mm, 17.52 mm, 21.52 mm tempered laminated glass.