A 7-piece ratchet combination wrench set . Key features and description of this type of set include: Components: The set typically includes seven combination wrenches, often with metric sizes such as 8mm, 10mm, 12mm, 13mm, 14mm, 17mm, and 19mm. Material: The wrenches are generally made from durable Chrome Vanadium (Cr-V) steel, known for its strength and longevity. Finish: They commonly feature a chrome-plated, often polished or matte finish, providing corrosion resistance. Design: Each wrench is a double-ended tool, featuring an open-ended spanner on one side and a ratcheting box end on the other, both typically fitting the same size fastener