Made of high quality 65Mn spring steel: 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 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 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 Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.