Curved shower curtain rod fabricated of alloy 18-8 stainless steel, type 304. Tubing is 18 gauge, 1" (25mm) outside diameter with a No 4 satin finish. Flanges are fabricated of heavy-duty rust proof Zamak 3 with a chrome finish. Flanges include two (2) countersunk 15/64" (6mm) diameter holes to accept No 10 (M5) flat or oval head screws (not included). Outwards bow of installed curved rod provides additional 8-1/4" (210mm) of shoulder room at mid-point of enclosure beyond what a similarly placed straight rod affords. A complete instruction manual is provided with each unit.