This heavy-duty grease gun coupler lock set includes 5 locks with a maximum pressure of 14000 PSI. The couplers are designed to fit any grease gun and work with all standard grease fittings. Made in the United States by Auxtur, these couplers are a reliable and durable choice for any automotive mechanic or DIY enthusiast. Each lock is made to withstand tough conditions and provide a secure fit for hassle-free lubrication. Upgrade your grease gun with these high-quality coupler locks today.