combination wrench
A combination wrench is a wrench with one open end and one socket end. A combination wrench is exactly what it sounds like—a combination of an open end wrench and a box end wrench. This gives you the versatility of an open end wrench that can fit into tighter spaces and the extra power of a box end wrench. The closed-ended side is designed to loosen tough nuts, while the open-ended side is used to unscrew it quickly.