2012 Heavy duty type double ball bearing swivel caster wheel KHX2-H4 *Dia.100-150mm *cap.250-350kgs *wheel ... at 50mm H4 Heavy duty type double ball bearing swivel caster wheel Heavy Duty Caster /Four Size available (4'',5'',6'',8'')[Model ... , display racks, handcart, transport vehicle ,general usage in market or industrial, etc. 8.Assorted colors (optional)High shock absorption/High abrasion ...