Quality Material: Made of soft and durable rubber, with good electrical resistance capability, the sealing rings fit these drill holes precisely and efficientlyConvenient to use: O-rings are designed for easy installation and secure drill holes, metal panels create a neat look on furniture and electrical boxesUsage: 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, etcFeatures: Dimensions: Rubber O-ring sizes are based on the groove inside diameter (ID) of the outer rim seam. This means that the 1 inch grommet has a groove width of 1 inch, and measures approximately 1.3 inch in outside diameter. and 1.7 cm inside diameter. Quality rubber material: The rubber grommets are made of quality rubber, which is soft and durable, has good electrical resistance capacity. Rubber O-rings fit these drill holes precisely and efficiently. Uses: Rubber grommets are designed for easy installation and for drilling 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-use: Essential rubber gaskets are for cars, RV wiring work, marine uses, leaky faucets and pipe repair etc. Good tool kit for repair shops, electricians, movers, handymen, plumbers, etc. Portable Clear 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. Content: 1.5 cm rubber eyelets. 5 rubber grommets of 2.2 cm. 5 rubber grommets of 2.5 cm. 20 x 0.6cm rubber grommets. 63 x 1.2cm rubber grommets. 40 x 6.35mm rubber grommets. 40 rubber grommets of 9.5 mm. 101 x 0.9 cm rubber grommets. 1 quick-close case.