Stainless steel 316 marine grade Corrosion and rust resistant - for a long service life Quality construction - smooth opening Pull on small ring to release/retract latch M6 Thread - Course Thread Pitch of 1 This is for one (1) quality marine grade stainless steel (AISI 316) pelican hook. Each pelican hook is stamped 316. The pelican hooks are made in the metric specification of M6. The thread is M6 and has a pitch of 1. 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.