Comply with DIN3017 Germany standard with Non-Perforated band(Worm Gear clamp), the perfect smooth of band's brim, no burr on surface to damage the hose when installation. With a simple hand twist , the color grip help you to install without tool. So easy and so convenient to drive the clamps! (For Low pressure requested only) Band Width: 9mm Material: W2 (AISI430S.S): Band & Housing are made of AISI 430 Stainless Steel , but Screw is Galvanized with Cr3+ coating, Handle is made from POM. Application: W2 (AISI430S.S): Hardware, Home DIY, Garden ,low applying of the corrosion resistance. For Low pressure requested only.