small wheels for carts 1. dia 40mm,50mm 2. nylon or PP wheel, 3. with M8*15mm,M10*15mm or 1/4",5/16",3/8" thread small wheels for carts A. with ball bearingB. black, white colors are available;C. used for cabinet, trolley etc;D. loading30/40KGs per piece. FS50 small wheels for carts