Item Description T-Clamp *2 Material: Stainless Steel Zinc-Coated Stud Band Width: 19mm | 0.75" Band Thickness:0.6mm Fit for 3" ID Silicone Hose Size Chosen Of T-Clamp Calculate the hose Outside Diameter. For example,if your hose Inner Diameter is 57mm, add the thickness such as 5mm, then the hose Outside Diameter is 57+5*2=67mm. So you need to choose this clamp: clamp range from 63mm to 71mm. The value of your hose Outside Diameter should be larger than the first value of the clamp range, less than the second. Brand siliconehosefactory Manufacturer Part Number SF3301 Manufacturer Warranty 3 Months MPN SF3301 UPC 6414307951721 .