Different sizes can meet your different needs. Multi-purpose wrenches are suitable for both standard 5/16ł to 7/8ł and metric 8mm to 22mm nuts and bolts; The size can be adjusted by moving it. This switch can do both American standard and Metric. With this versatile wrench you can do a lot of things without having to swap different sized wrenches. OUR GUARANTEE We are confident that we offer some of the best products on the market. Therefore, we provide a 30-day guarantee. We will make every effort to ensure that you are completely satisfied with your purchase. Online shopping can seem daunting. We want you to know that there is absolutely zero risk of purchasing something. We won't make it difficult if you don't love it. We offer email and ticket support 24 hours a day, 7 days a week. If you require assistance, please contact us. Please contact customer service if you have any problems with your purchase.