Material: The rubber ring is made of high-quality rubber, soft and durable, with uniform wall thickness, good electrical resistance, strong tensile strength, and good toughness. 7 different sizes: 50pcs x 7.14mm, 40pcs x 9.53mm, 30pcs x 12.07mm, 20pcs x 15.88mm, 10pcs x 19.05mm, 10pcs x 22.23mm, 10pcs x 25.4mm. Easy to use: The O-ring design is easy to install and allows for drilling connections. The metal panel creates a neat appearance on furniture and electrical boxes. The coil can also protect wires and play an insulating and sealing role. Uses: Rubber O-rings are used to repair circuits, etc. It can prevent metal-to-metal contact to protect wires, cables, metal panels, etc. that pass through the firewall. Convenient Storage: These rubber rings are packed in a separate storage box. You can store and protect these small parts well. Material: Rubber 7 sizes: 7.14mm/9.53mm/12.07mm/15.88mm/19.05mm/22.23mm/25.40mm Quantity: 170 Color: Blackluckymeet