Features: 1.Every product has a unique Manufacturing Part Number label on the inner package that proves it has been qualified,which include Part Number,Model Number and inspection date information; 2.If you have any questions about the item,please provide us the Manufacturing Part Number for checking,your profits will be guaranteed. 3.Size: 4x1cm/1.54x0.37inch (DiaxH) 4.Scope of application: high and low voltage electrical cabinets, boxes, outlets. 5.Purpose: Ensure that the wires are not scratched by the cabinet or box. 6.Material: Made of rubber, suitable for long-term use. 7.Advantages: high elasticity, high air tightness. Specifications: Material: Rubber Color: Black Brand name: Unbranded Size: 4x1cm/1.54x0.37inch (DiaxH) Weight: 894 g Package include: 120 x Wiring Grommets