The ring is an organizer for box end wrenches. Wrench-rings hold wrench sizes 3/8” (10mm) and up. The perfect gift for plumbers, fabricators, electricians, farmers, and any other professional worker that works out in the field. Package contains one of each color, red, white, and blue. Wrench rings are color coded to give you quick access to the type of wrench you need. The red ring is for standard boxed end wrenches. The blue ring is for metric boxed end wrenches. The white ring is for adjustable and pipe wrenches. When your wrenches are kept together, you will save time by not searching for your wrenches. Use our heavy-duty ring to organize other items as well. Rings are sold individually with different sizes and colors as well, scroll down to (about this seller) click on Wrici to see all options. WRENCHES NOT INCLUDED.