... ,grey,white,gold,blue etc ,various per customer requirement Plastic caster wheel Features:1) Material: nylon2) Dia 30/40/50mm;3 ... as per your decision. Pin size :DIA.6*20 / 8*20/ 8*22/ 11*22 Scew stem size: Dia.1/4"*15 ... " /1/4"*25" /3/8"*3/4" 5/16"*1-1/4" /5/16"*1 ... wheel, plastic parts ; accessories ; hand spring ; standard spring.ETC. plastic caster wheel ,50mm pressure ...