This is for one (1) quality marine grade stainless steel (AISI 316) 5/16" UNC eye bolt in heavy duty grade. Each bolt is stamped 316 and 5/16" and laser etched with the makers mark. The bolts are manufactured in the imperial specification style of 5/16" UNC and require an imperial 5/16" UNC hole or nut. 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 Limit 4400 lbs.