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There are two types of wrenches: open end and box end. Both types are necessary for automobile maintenance and repair. The box end wrenches have a better grip than the open end type, but the open end wrenches must be used in some cases such as fuel and brake line work. The wrench head  can be angled from straight or 0 to right or 90 to make access to bolts and nuts easier. The standard wrench offset is 15 to 30. Box end wrenches  in ratcheting models are more efficient, but adjustable open end wrenches are also very handy.

More and more auto work requires Allen wrenches and Torx or star wrenches. Allen wrenches are hexagonal. Torx bits are multi-serrated inserts fitting inside a bolt or screw head. 

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