1.5"-2" office chair caster 1.screw size:3/8"/1/2" 2.capacity:20kgs,25kgs 1.5"-2" office chair casteravailable for office chairs or furniture equipments,plant movers,cabinet casters,bed wheels etc. Item numberwheel diameter(mm)plate finishoverall height(mm)screw length(mm)screw diameter(mm)BT4040zinc plated finish/chrome538/10/123/8",1/2"BT5050zinc plated finish/chrome608/10/123/8",1/2"