Superior brass structure for increased durability Offers multiple mounting options: through-glass, UV adhered, and wall mount Drill a hole in the glass for installation or adhere it using UV adhesive Intended for use with monolithic tempered glass Incredibly easy to maintain C.R. LAURENCE DRH1BN CRL Brushed Nickel Designer Robe Hook. Solid brass Thru-Glass Robe Hook for 5/16" to 1/2" (8 to 12 mm) glass is available in many popular finishes. A 1/2" (12 mm) diameter hole is required. The Hook may also be adhered to any glass thickness with UV Adhesive to avoid drilling, or mounted to wall with supplied Hanger Bolt. Clear gaskets are included.. Part Numbers Variations: DRH1BN