This is for two (2) quality marine grade stainless steel (AISI 316) spring snaps with eye end 4" length. Each spring snap is stamped 316. The spring snaps are in the US specification style of 4". The metric equivalent is generally considered to be 100mm. 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.