Sierra Exhaust Hose T-Bolt Band Clamp 2-1/2"The Sierra 18-720-2120 Exhaust Hose is designed to fit Shields series 200, 250, and any application below the water line. Band is 316 stainless steel and is .025 thick by .75 wide; Includes an extra long 1/4" bolt and a nylon inset locknut; Bolt, but, and trunion are 18-8 (304) stainless steel; Maximum torque of 75 inch pounds; Specifications: Diameter size: 2.68-3.34" or 68.1-84.8 mm; Wt. "C": 15.6; I.D.: 2-1/2" or 63.5 mm;