Superior Craftsmanship: Constructed from high-quality materials, each closed rubber grommet offers exceptional flexibility, resilience against aging, and resistance to folding. Designed to provide robust insulation, these grommets are dust-proof, flame-retardant, and effectively prevent metal friction damage to wired and other materials. Comprehensive Kit Details: The assortment includes various sizes to suit multiple applications: M7.14 (58pcs), M9.53 (44pcs), M12.07 (30pcs), M15.88 (20pcs), M19.05 (16pcs), M22.23 (10pcs), and M25.4 (10pcs), each designed to meet different needs for sealing or isolating wires through panel entries. User-Friendly Installation: rubber grommets simplify installation by eliminating the need for a lock nut on the opposite side. Place the grommet on one side only; it seals upon installation and opens only when the central membrane is punctured, ensuring a secure and stable setup. Versatile Usage: These rubber grommets are indispensable in protecting wires and cables from metal edges, thus mitigating the risk of damage. They're suitable for automotive, plumbing, and electrical installations, ensuring cables stay protected from external elements like dust and rain. Plastic boxes come in random styles, no specified colors are accepted Material: rubber colour: black Package Contents: 188 x Closed Rubber Grommet 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.