The slotted shape of these sockets fits over wing nuts to tighten and loosen them with more force than you can by hand. These sockets are sturdier and have more give than manual-drive sockets, so they'll withstand the high torque and force of impact tools. They require a locking retainer. Use with an impact wrench that has a pin-style socket retainer, or use a socket retaining ring with tools that have a hole- or hole-and-ring style socket retainer.