【What You Get】: 12 Pack Heavy Duty Pin with Square Retaining Clip allows for quick locking and extra release. 【Material】: Made of good quality spring steel and high strength carbon steel with maximum endurance, zinc plated to resist rust and corrosion for long lasting durability. 【Size】: 8mm (5/16 in) diameter; Usable length of 60 mm (2-31/64 in) diameter secures coupler locks, jack legs, pintle hooks and more 【Convenient and Easy to Use】: The user-friendly design allows them to be handled easily while maintaining effective security. Secure your equipment, gear, trailer loads and to perfectly secure coupler locks, jack legs, pintle hooks and more, etc. 【Wide Application】: Use for farm, lawn and garden, trailer hitch receivers and other applications to secure PTO attachments and accessories. Description: This safety pin is constructed of high-strength carbon steel with maximum endurance for long-lasting durability. The square retaining metal clip provides quick locking and extra play