This is for one (1) quality stainless steel (AISI 304) 3/8"-16 x 6" Round Head Square Neck Carriage Bolt. The smooth domed head provides a low profile finish. The Square neck locks directly into wood and pre-punched square steel holes. Not to be used for overhead lifting. AISI 304 stainless is a standard grade of stainless and is corrosion resistant.