The band's width of this hose clamp is 9mm and its thickness is 0.7mm or 0.8mm.
The screw material of this type of hose clamp can be steel with hot treatment or stainless steel. The band's material is normal steel plated zinc or stainless steel.
They are used in plastic hoses or other pipes and are often packed with inner box.
German Type Hose Clamp