Magliner 131020B 5" x 1-1/4" Polyurethane Replacement Swivel Caster with Brake for Gemini Convertible Hand Trucks, 10" Length, 4" Height, 7" Width 5" x 1-1/4" Polyurethane Swivel Stem Caster with Brake Stem measures 1" OD x 2.5" Length Longest-lasting caster in the industry