40mm caster wheel 1. wheel diameter is 50mm, 2. nylon or PP wheel, 3. with M8*15mm,M10*15mm or 1/4",5/16",3/8" thread 40mm caster wheel ,A. with ball bearingB. black, white colors are available;C. used for cabinet, trolley etc;D. loading40KGs per piece. FQ40 40mm caster wheel