Acorn nut caps for bolts and nuts from M5 to M30 in Anthracite (RAL 7016), available in sets of 5, 10, 25, 50, or 100 pieces. Made from high-quality, UV-resistant PE polyethylene, these caps are durable, weatherproof, and protect against corrosion. Designed with precision, they feature a hexagonal tab for a secure fit and a polished finish. Ideal for protecting bolts in construction, machinery, furniture, playgrounds, and garden architecture. Easy clip-on installation ensures a snug and reliable fit without tools.