This is for one (1) quality stainless steel (AISI 304) D shackle. Each shackle is stamped 304 and laser etched 3/4". The shackles are marked in the US specification style of 3/4" (for the shackle size). The Metric equivalent is generally considered to be 19mm. Not to be used for overhead lifting. AISI 304 stainless is a standard grade of stainless.