These open end wrenches have a wrench head on one end of the handle with no head on the opposite end that allows for a secure grip on the full length of the handle. They can access fasteners from the top and side compared to box wrenches that can only access a fastener from the top. The single end is metric size for use on one specific size fastener.
Open end wrench sets can come with different opening angles on each end for access to fasteners in tight spaces. They have a wrench head on each end and allow access to fasteners from the top and side compared to box wrenches that can only access a fastener from the top. These metric double end wrenches can have a different size on each end so that each wrench can be used for two different size fasteners.
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