Adjustable wrenches cover a range of sizes with one tool, which makes them convenient and less precise — they can slip and round a tight fastener. Combination wrenches (open end and box end) are the standard for general work; the box end grips all six flats and is the one to use on a tight fastener. Ratcheting combination wrenches speed up repetitive work.
Pipe wrenches grip round pipe with serrated jaws and are directional — they grip one way and slip the other, which is why the jaw orientation matters. Chain tongs and strap wrenches grip pipe and irregular shapes without marking, used on finished or thin-wall pipe.
Torque wrenches apply a specified torque. The range must bracket the value being applied — a wrench used at the bottom of its range is inaccurate, and one used above its range is overloaded. Torque wrenches need calibration and should be wound back to zero after use.
Specialty wrenches — flare nut, crowfoot, ratcheting box, hex and Torx keys — exist for fasteners that standard wrenches cannot reach or grip.
