Rubber grommets are usually inserted in holes in metal panels or certainother materials in order to protect wires, cables or cords, improvefriction or seal cables passing through it, from a possible mechanicalor chemical attack. Wiring protector in metal junction areas. Durable yet flexible rubber rings, the most efficient fabric to pull through drill holes which need a fit. Exclusivedesign for easy installation and click snap affixing drill holes ormetal Our grommets are conveniently sectioned in a reusable plasticcase, 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.