That is for ten (10) quality marine grade stainless steel (AISI 316) quick links 4mm. The Imperial an identical is most often regarded as to be 5/32″. Every quick link is stamped 316. Not for use for overhead lifting. AISI 316 stainless is a premium grade of stainless and is thought of as by many to be best in class. 316 stainless is corrosion resistant and very durable even within the harshest of conditions. Working Load Limit 616lbs.
Stainless Steel 316 Marine Grade – for a long service life
High Quality precision screw provides tight and protected connection
Ideal for boating, camping, mountain climbing and backpacks
Working Load Limit 616lbs
Corrosion and rust resistant, ideal for chain fittings, chains, ropes and webbing