This is for four (4) quality marine grade stainless steel (AISI 316) 6mm M6 eye bolt. Each bolt is stamped 316 and M6 (for the size in mm, M6) and laser etched with the makers mark. The bolts are manufactured in the metric specification style of 6mm or M6 and require a metric nut or threaded hole. Not to be used for overhead lifting. AISI 316 stainless is a premium grade of stainless and is considered by many to be best in class. 316 stainless is corrosion resistant and very durable even in the harshest of conditions. Breaking Load 520lbs.