Alvord Polk 127-1 High-Speed Steel Chucking Reamer, Right Hand Spiral Flute, Round Shank, Uncoated Finish, Size: 1/4 and Letter Size E Right-hand spiral reamers are good for use in blind holes (holes that do not extend all the way through a workpiece), as they pull chips up and out of the hole Spiral flute reamers are recommended for reaming holes with interruptions, as they prevent damage to the workpiece edge and tool Round shank tools are cylindrical and should be held in a good-quality toolholder in order to prevent the reamer from slipping in high torque applications, which can cause tool freeze, loss of accuracy, and tool damage (bright) tools have no finish or coating. They are a good choice for general purpose applications High-speed steel is a common general purpose steel for cutting tools, is compatible with a variety of materials, and tends to be lower in price than cobalt steel or carbide