1-2" black office chair caster hadlement:zinc plated finish capacity:20kgs,25kgs function:suitable to the plant mover,light duty move,office chair etc. Item numberwheel diameter(mm)plate finishoverall height(mm)top plate(mm)screw diameter(mm)BP4040zinc plated finish/chrome5327*275.2BP5050zinc plated finish/chrome6027*275.2