Rated Up to 2-1/2 Ton Per Pair on a Floor Jack Caster Size - 2-3/8 Inch (60mm) Wheel - 1-3/4 x 7/8 Inch (45mm x 23mm) Stem - 1/2 x 1 Inch (12-1.75 by 25mm) Hex Nut on top of caster - 7/8 Inch (22mm) All measurements approximate