HPS 100% marine grade 316 stainless steel T Bolt hose clamps size # 64 with effective range 2. 87" - 3. 19" (73mm-81mm) perform well in saltwater applications and offer better corrosion resistance than the standard 304 T-bolt band clamp; therefore 316 tbolt clamps are commonly used to provide leak-proof connections on marine engine and exhaust systems. Professionals also utilize the high strength 316 T Bolt clamps in applications such as water treatment and sewage systems, military, filter bags, telecommunication devices, sanitary systems, food and pharmaceutical processing equipment. Technical Specification:Perform well in saltwater applications and offer better corrosion resistance than the standard 304 T-bolt band clamp. Size # 64. Effective Size Range: 2. 87" - 3. 19" (73mm-81mm). 100% Marine Grade 316 Stainless Steel Band, Bolt and Nut. High strength with superior welded construction. 3/4" (19mm) band width with floating bridge. Band thickness: 0.6mm. Maximum Torque Spec 75 in. lbs. Can be used with HPS 2-11/16" silicone hoses. Part Number: 316-SSTC-73-81. UPC: 648044880938. Quantity: 1. REMARK: Two clamps are recommended to be used on each end of a wet exhaust installation.