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Adjustable hand reamers or adjustable-blade reamers are tools used to enlarge or finish previously drilled holes in metalworking. They have replaceable blades that can be adjusted through tapered grooves to create the desired hole diameter. With the use of a wrench or a vise grip, reamers are slowly rotated while being fed into the hole. Adjustable hand reamers are normally used in assembly work to make parts fit and are available in various diameter ranges.

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