Ultimate Locking Security :Engineered with fast, safe, and effective spring locking pin​​ mechanism to prevent relative rotation and ensure no bolt loosening. Sturdy R-clip design​​ guarantees secure retention for tiller tines, hitch systems, and critical joints. Durability: Made of premium heavy-duty carbon steel with zinc plating for corrosion resistance and anti-rust performance. Suitable for indoor/outdoor use in extreme conditions, ensuring very long life in any workshop – no need to replace. Universal Equipment Solution: Widely used in Tractors, Farm Equipment, Lawn and Garden Equipment (e.g. lawnmower attachments like leaf baggers), Trucks, Campers, and Hitch Pin Lock Systems. Compatible with cotter pin kits and pin retainer assemblies. Effortless Year-Round Utility: Quick-release air pin cotter function enables instant installation/replacement without tools. Useful all year round– from spring tiller maintenance to winter trailer hitch setups. Replaces fragile cotter pins with industrial-strength reliability. Precision OEM Compatibility: Designed as tiller replacement parts for Mantis/Echo tiller's needle teeth holder. Trailer hitch pin and clip versatility meets for ASTM/SAE standards, making it the indispensable upgrade for DIY repairs and pro workshops.