20 mm.(1-5/16"-12UNF)M - M33x2Mflat 1500 Bar Product description Adapter various applicationsConnections : 20mm. Type M (1-5/16"-12UNF) M - M33x2M (flat)Dimensions : Hex 1-3/8" x 2.383" ( ± 60.5 mm.)Material : st. steelPart number : 20-026-015