Quality Material: Made of soft and durable rubber, with good electrical resistance ability, the sealing rings fit these drill holes precisely and efficiently Convenient to use: O-rings are designed for easy installation and allow drilling holes to be fixed, metal panels create a neat look on furniture and electrical boxes Usage: gaskets rubber O-rings are used for repairing wiring, etc. and can prevent metal-to-metal contact to protect wiring, cables passing through firewalls, metal panels, etc. Features: Dimensions: Rubber O-ring dimensions are based on the groove inside diameter (ID) of the outer rim seam. This means that the 2.5cm eyelet has a groove width of 2.5cm, and measures approximately 3.3cm in outside diameter.and 1.7cm in inner diameter. Quality Rubber Material: Rubber Grommets are made of quality rubber, soft and durable, have good capacity electrical resistance. Rubber o-rings fit these drill holes precisely and efficiently. Uses: Rubber grommets are designed for easy installation and to drill holes and metal panels. Usually applied in holes in metal panels or other materials to protect cables, wires, cords against possible mechanical or chemical attack, in order to protect wires, cords, cables, etc. and give your furniture and electrical boxes a neat look. Multi-Purpose: Essential rubber gaskets are for cars, RV wiring work, general uses leaky faucets and pipe repairs, etc. Good tool kit for repair shops, electricians, movers, handymen, plumbers, etc. Portable transparent case: The 180 rubber grommets are packed in a storage case, you can carry them with you for RV trips etc. Features: Material: rubber. 8 sizes: 5/8, 7/8, 1, 1/2, 7/16, 1/4, 5/16, 3/8. Quantity: 180. Colour: black. Contents: 1.5 cm rubber eyelets. 5 rubber eyelets. 2.2 cm rubber. 5 rubber grommets of 2.5 cm. 20 rubber grommets of 0.6 cm. 63 x 1.2cm rubber grommets. 40 x 6.35mm rubber grommets. 40 x 9.5mm rubber grommets. p> 101 x 0.9 cm rubber grommets. 1 quick release case.