gorilla 39GORILLA® BY CONTINENTAL CONTITECH - ID (ID MM) 500 PSI MADE IN USA FLAME RESISTANT USMSHA NO . 2G-IC-14C39. Back to the index.Diameter: 39.00 mm; Thickness: 11.00 mm; With crown guards: 43.10 mm; Lug to lug: 50 mm; Water resistance: 100M330FT10ATM; Scratch resistant sapphire, double anti-reflective