Description: Rubber grommets are usually inserted in holes in metal panels or certain other materials in order to protect wires, cables or cords, improve friction or seal cables passing through it, from a possible mechanical or chemical attack. Wiring protector in metal junction areas. Durable yet rubber rings, the most efficient fabric to pull through drill holes which need a precise fit. Exclusive design for easy installation and click snap affixing drill holes or metal Our grommets are conveniently sectioned in a reusable plastic case, protecting the grommets while on the go. Applicated for automotive, marine and RV wiring. Specification: Material: PVC Color: Black 3mm Outer Diameter*Height: 0.8 x 0.5 cm / 0.31 x 0.2 inch Inner Diameter: 0.3 cm / 0.12 inch 4mm Outer Diameter*Height: 1 x 0.5 cm / 0.39 x 0.2 inch Inner Diameter: 0.4 cm / 0.16 inch 5mm Outer Diameter*Height: 1.1 x 0.5 cm / 0.43 x 0.2 inch Inner Diameter: 0.5 cm / 0.2 inch 6mm Outer Diameter*Height: 1.1 x 0.5 cm / 0.43 x 0.2 inch Inner Diameter: 0.6 cm / 0.24 inch 8mm Outer Diameter*Height: 1.4 x 0.5 cm / 0.55 x 0.2 inch Inner Diameter: 0.8 cm / 0.31 inch 10mm Outer Diameter*Height: 1.6 x 0.5 cm / 0.63 x 0.2 inch Inner Diameter: 1.0 cm / 0.39 inch Package Includes: 1000 Pieces Electrical Gasket Kits Note: Please allow minor error due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item.