2 Pieces of 19mm Ball Bearings with 10mm diameter integrated 10mm (25/64" Inch) Pin Diameter 10mm x 19mm x 123mm 2 Pieces of 19mm (3/4" Inch) Ball Bearings with 10mm (25/64" Inch) diameter integrated 123mm (4 27/32") Long Axle, Pin Diameter is 10mm, Bearings Outer diameter is 19mm (3/4" Inch), and Width of the assembly is 123mm (4 27/32" Long), Bearings are made of Chrome Steel.