13 mm.(1"-12UNF)M - M33x2Mflat 1500 Bar Product description Adapter various applicationsConnections : 13mm.Type M (1"-12UNF) M - M33x2M (flat)Dimensions : Hex 1-3/8" x 2.383" ( ± 60.5 mm.)Material : st. steelPart number : 20-026-016