TJ Longda 50 Pieces Stainless Steel Single Ear Hose Clamps size 1/4" or 7mm 1. Materials: Stainless Steel Band UNS S30400. 2. Smooth inner circumference for 360 degree uniform seal. 3. To use in the industries like automotive, food and beverage, and so forth. 4. Precise tongue-in-groove seamless design.