- - 1 set has 4 wheels with wheel boots on all legs - - Easy to put on, just pry off the old rubber ball and put it on the whole set. - - The product is designed especially for use with shelves. - - Can - Can be put on a 1 inch round pole clothes rack. - - Can be modified to fit with shelves (Measure the size before ordering) - - Durable ABS plastic material, smooth wheels, very attractive to use. - - When complete 4 wheels are assembled, it can support more than 40 kg.