Mounting materials.
See below an overview of the quality markings for hose clamps:
| W1 | All parts made of galvanized steel |
| W2 | Band + housing made of chrome steel AISI 430; galvanized steel screw (or bolt) |
| W3 | All parts of chrome steel AISI 430 |
| W4 | All stainless steel parts - A2 stainless steel - AISI / 304 stainless steel |
| W5 | All stainless steel parts - stainless steel A4 - AISI / stainless steel 316 |




