C.R. LAURENCE Z130BN CRL Brushed Nickel Z-Series Zinc Small Square Glass Clamp for 1/4" and 5/16" Glass. CRL Z-Series Clamps are available in your choice of round or square shapes and come in either economical zinc construction or durable stainless steel construction. CRL"s Z130 Series Glass Clamps will accommodate glass thicknesses from 1/4" to 5/16" (6 to 8 mm). The radius base is designed to apply on 2" (50.8 mm) tubing. By drilling a hole in the glass the pin included with each clamp can be used to eliminate glass slippage. Popular applications are partitions mezzanines wind breaks railings and other commercial uses. CRL Cat. No."s ZB0LT (B0LT) and ZRNUT (RIVET-NUT) are used for securing Z-CLAMP to tubing. Appropriate gaskets are included with each clamp. A variety of finishes are offered to match most any commercial decor.. Part Numbers Variations: Z130BN[]