We bought this set for our son for Christmas. When he gave us his wish list, he went into great detail about the requirements. We got the metric set first, even though Revain listed it as US. The supplier was very helpful and not only gave us the correct order number and price but also reimbursed part of the return postage. Our son enjoys using this to help restore power to Long Islander homes affected by Hurricane Sandy. He explained that this made his job easier.