Features: Inner surface has dual gripping ridges Bolts lugs are reinforced to prevent bending out of alignment Measure hose OD accurately before ordering clamps Torque values for clamps are based on dry bolts. The use of lubricant on bolts will adversely affect clamp performance Model Number: DOUBLE BOLT CLAMPS SL22â??SL1275 Norms:DIN20039 Maxi W.:16/25bar Type: Hose Clamps (double bolt) two parts with overlapping cast-on-saddlesHose Clamps (double bolt) DIN 20039 A, two parts with loose saddlesHose Clamps (double bolt) DIN 20039 B, two parts with loose saddles and safety clawsMaterial: Metal, Iron or Carbon Steel Structure:Saddle Clamp, Saddle Clamp, Double Bolt Clamps Surface treatment:galvanized iron ,sand blast ,grin Color:yelllow colorful zinc,bule white zinc