Left-hand spiral reamers are good for use in through holes (holes that extend all the way through a workpiece), as they push chips ahead of the tool and into the hole
Spiral reamers are recommended for reaming holes with interruptions, as they prevent damage to the workpiece edge and tool
Taper pipe reamers are intended for reaming holes to be tapped with American National Standard Taper Pipe threading
Uncoated (bright) tools have no finish or coating. They are a good choice for general purpose applications
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