Specifications： -- Material: Carbon Steel -- Surface Finish: Zinc plated to resist rust and corrosion -- Qty: 4 PCS safety lock pin in a package. -- M6 Diameter Pin This safety coupler pin is 2.95" (75mm) long(End to end) and 0.08" (2mm) in diameter, suitable for quick release applications in variety situations. * Strong Bearings Capacity These pto lock pins are structurally strong with thicken round shaft and will not easy to loosen during use. Create a reliable way for keeping trailer coupler latch engaged with the trailer ball, provide ample strength. * Easy Using Simply open or close the spring-loaded latch when disassembling or using it, very quick and simple operation. * Versitile Tools They are great for table saw, lawn, gardening, farming, truck, boat, trailer or other locking applications. Small tools but have wide applications. * Satisfying Customer Services We provide 30-days money-back and timely after-sale response, if you have any questions, please contact us. We will try our best to solve your issue as soon as possible. Welcome to INCREWAY, your satisfaction is always what we pursue.