This is for one (1) quality marine grade stainless steel (AISI 316) Snap Shackle with Forged Swivel Jaw Type 2476 12mm (1/2"). Each snap shackle is laser etched 316. The size indicates the inside dimension of the loop. This snap shackle features a full-swivel eye which prevents tangles. 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.