【Package Contents】8 different sizes of rubber gaskets for fixing mounting screws, repairing wiring. 5/8'', 7/8'', 1'' (5 of each), 1/2'' (20 pieces), 7/16'' (25 pieces), 1/4'', 3/8 '', 5/16'' (40 of each) and an assortment box, there is also a description under the cover with detailed size and number for easy identification. suitable for your different needs, good retrofit infrastructure. 【Nitrile Butadiene Rubber Materials】The O-ring grommet is made of high quality rubber, smooth surface, heat resistance, anti-aging , good sealing, good electrical resistance and not easy to break. It can be precisely and efficiently adapted to drilling, easy to install and keep the cable clean and tidy. 【Easy to use】 The rubber grommets are designed for easy installation and click to secure the drilling holes, metal panels. Usually applied in the holes of metal panels or other materials to protect cables, wires, cords and keep the cable clean and tidy. 【Transport and 【Easy Storage】180 different sizes of open rubber grommets packed in transparent plastic boxes, each size with spacing, with snap-lock lid for easy carrying and storage. 【Widely Application 】Rubber grommet rings are suitable for wiring repair, can prevent metal to metal contact to protect wiring, cables passing through firewalls, metal panels, also perfect for pipes, faucets that leak, etc. Quantity delivered: 1 box of 180 pieces