... , stainless steel with satin finish. 16-gauge (1.6mm), 1-1/4" (30mm) square tubing and 18-gauge (1.2mm), 1" (25mm) diameter ... seamless tubing.Mounting Flanges (2) — 18-8 S, type-304, 3 ... ) diameter with three mounting screw holes.Baseplate — 18-8 S, type-304, heavy-gauge stainless steel.Spring — 17-7, type-301, 24 ...