Roadformer 3 inch T bolt hose clamps are 100 stainless steel, specifically 1428 Stainless Steel Bolt, 34 Floating Bridge Band in 304 Stainless Steel, and Nylon Insert Locknut. Stainless Steel material does ensure the outstanding performance in Antirust and Anticorrosion 3 inch TBolt Hose Clamp Working Range Diameter 2.81 3.11 same as 71mm 79mm for 3 inch Hose, Suggest you please check your Hose OD Diameter to select item with appropriate working range to fit your hose size before purchasing. Roadformer TBolt Hose Clamp provide leak proof seal for hose and tube assemblies, in general frequently installed on exhaust, turbo charge, engine cooling and airintake systems. These TBolt Clamps feature provide uniform sealing pressure for a positive, reliable connection even in pretty hard working environment Roadformer T Bolt Hose clamps are designed to use in the situation of high vibration and high pressure with great performance in keeping consistent force and longterm durability. These t bolt hose clamps are widely used in Automotive, heavy trucks, industrial machinery, offroad equipment and Agriculture industry Roadformer TBolt Hose Clamps are designed to much easy and convenient to install and use. Simply slide the clamp overlap the hose, adjust the bolt position and use a wrench or common hand tools to achieve your desired tightness 2 Pieces in a Package comes to you. Standard Amazon Warranty Term guaranteed. Roadformer Premium Product Quality set the industry standard