Made of 65Mn spring steel: durable in use and have a long serving time.nice construction and hold very well. The spring clamps include 7 different diameters clamps to adapt to different hoses: 7mm, 9mm, 10mm, 11mm, 14mm, 15mm, 16mm.Come with a plastic storage box has classification figure inside, could facilitate your storage and classification size. 360 degree inner ring precision design: prevent damage to the pipeline effectively. Smooth inside and will not bite into hose. Release or tighten the bolt to adjust the band diameter range. Spring hose clamps are used in a wide range of applications, suitable for fuel lines/vacuum hoses/gas pipe/air hose/water pipe/silicone hose, great choose for garage, boats, motorcycles, lawn and car engines connection, etc. Color: Black Material: steel Package Contents: 80Pcs * Spring Band Hose Clamps 1 * storage box