... of chairs 3,office chair caster can past BIFMA testing office chair casterItem NO: HYL-091,Color:Black2,Material: PU3,Pin size:11x22mm4,Wheel Diameter:60mm5 ... :55x33x31cm7,Specification:Meet BIFMA StandardThis chair caster performance on carpet or hard floors Function:Fit for all types of office furniture specifically office chairs. office chair caster