High Quality - Plastic bolt covers are made of plastic, durable, waterproof, not easy to break, and provide good protection for screws and nuts. Effect - Prevent screws and nuts in the natural environment from rusting, aging, cracking, dusting, avoiding accidental scratches, and extending the service life of screws and nuts. Easy to Use - Our plastic bolt covers are designed for hassle-free installation, saving you time and effort. Simply clip them onto your bolts and nuts for instant installation. Wide Applications - These plastic bolt covers are perfect for a wide range of applications including machinery and equipment, petrochemical industry, gas pipeline valves, bridge guardrails, railways, etc. Dimensional Information - The overall height is 20mm/0.79'', the straight edge height is 10mm/0.41'', the outer edge is 22mm/0.87'', the inner edge is 17mm/0.67''.