OJOL4D Box end. A box, or closed, end wrench is used where there is room to place the wrench mouth around the fastener. Wrenches: The purpose of a wrench is to turn a bolt head or nut. Pliers should not be used as wrenches to tighten or loosen fasteners. Pliers: Think of pliers as an extension of your fingers, only stronger.|DonÂ’t Waste Time! {3|4|5|6|7|8|9|10|Three|Four|Five|Six|Seven|Eight|Nine|Ten} Facts Until You Reach Your Slot In Chinese