Description ITEM DESCRIPTION: 1. T-Bolt clamps provide uniform sealing pressure for a positive, reliable seal which are frequently installed on coolant and air-intake systems for construction, truck, and bus engines. Through the use of bolts and studs design, T-Clamps can be implemented a much more tighter and durable hold for silicon couplers, rather than the normal screw design clamps. 2. 100% Brand New 3. Clamp Range:133 mm-141 mm or 5.24"-5.55" 4. Material: 301ss Stainless Steel 5. Band Width: 19 mm or 0.75" 6. Band Thickness: 0.6 mm 7. This T-Bolt Clamp fits for 5" or 127 mm inner diameter silicone hose fits for 5.4" or 137 mm outer diameter silicone hose NOTES: 1.The way of choose T clamp: Calculate your hose Outside Diameter : Hose Outside Diameter = Hose inner Diameter + 2 X Hose thickness then you can calculate whether your hose is belonged to the clamp range. 2.If the clamp range is 35 mm-43 mm, the value of your hose Outside Diameter should be larger than the first value of the clamp range, less than the second.