HEAVY DUTY CHANNEL BRIDGE T-BOLT 30020 - Channel Bridge T-Bolt 30020 clamps provide the added assurance of a rigid bridge liner to help prevent leak paths (good for softer hose), and uniform sealing pressure for a positive, reliable seal. Designed for use in high vibration and large diameter applications common in heavy trucks, industrial machinery, off-road equipment, agricultural irrigation and machinery. Material Specifications: T-Bolt: 1/4 Plated Carbon Steel - Hex Nut: 7/16 Plated Carbon Steel, Nylon Insert - Band: 3/4, 300 Stainless - Bridge: 3/4, 300 Stainless - Trunnion: Plated Carbon Steel - Installation Torque: 75 in-lbs (8.5 Nm) Size: No. 188 Fits Hose with Inner Diameter of: Min (in)= 1.88, Max (in)=2.19, Min (mm)= 47.6, Max (mm)= 55.6.