Quality material: The flexible end cap is made of rubber, soft and durable, providing long-lasting use. It can be cut to the desired length according to individual needs, offering convenience. Wide application: This rubber cap protector fits fence railings, iron covers, bolts, screws, or nuts, covering scratches or burrs from cutting. It also protects against injuries from sharp rod and tubing edges. Easy to operate: Simply cut the protective cover to the required length, open the slit, and position it appropriately for quick and convenient use. Practical design: These bolt rubber caps feature a classic black color and are suitable for various household applications. Available in four sizes with soft, elastic material for effective protection. Color: Black Material: Rubber Size: Four inner diameters: 7mm, 10mm, 12mm, 20mm Package Contents: 80 pieces (20 each of 7mm, 10mm, 12mm, and 20mm protective caps) Note: Lighting and display differences may cause slight color variations. Measurement error is +/- 1-3cm.