This is for one (1) quality marine grade stainless steel (AISI 316) quick link 3.5mm. The Imperial equivalent is generally considered to be 1/8". Each quick link is stamped 316. 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 for a long service life. Breaking Load = 2420lbs Black Nitride products undergo thermal chemical diffusion and quench bath treatments for unmatched durability and performance. With a case depth of 0.001", they offer increased wear resistance, improved fatigue strength, enhanced lubricity, and corrosion production. Black Nitride products are ideal for demanding applications while maintaining a sleek matte, professional look.