C.R. LAURENCE S0GC90SB CRL Satin Brass 90 Degree "Sleeve Over" Glass Clamp. CRL Sleeve Over Glass Clamps are designed to provide a mechanical fastener to cover the shear forces placed on the glass panels. No special fabrication of the glass is required. Can also be used to secure the glass panels in position while the applied silicone sealant in the joint cures (the silicone sealant glues the glass panels together, prevents water leakage, and provides the pull strength to keep the panels from separating). Clamps are secured in place by nylon tipped Allen set screws..