- 1/2 INCH THICK GROUND AND POLISHED BOROFLOAT™ GLASS
Each 4.5” diameter BOROFLOAT™ glass is fully stress relieved with ground edges. The top face of the glass is above the stainless steel frame to prevent water pooling when used during rain.
- SOLID CONSTRUCTION AND EASY MOUNTING
The ERL Model SGMRD-4 is constructed from 300 series stainless steel and mounts to any standard 4” 150 lb. class mounting flange, having (8) 0.750” diameter holes on a 7.50” diameter bolt circle.