swivel chair caster,chair caster, caster wheel, nylon ,dia 50mm, ,chair caster, BIFMA standard or NON BIFMA standard swivel chair caster,chair caster, caster wheel,1)chair caster, nylon ,dia 50mm, with top fixing plate size:30*30*1.5/mm, BIFMA standard.2)Without brakeModern style & exquisite quality3)Competitive price, fast delivery & good after-sales service chair caster