This is for five (5) quality marine grade stainless steel (AISI 316) Triangle Rings Welded 5/32" x 3/4" (4mm x 20mm). 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.