Adjustable Hand Reamer 21-23mm High Speed Steel H8 6 Straight Flutes Milling Cutter ToolHigh-speed Steel Reamers: Accuracy: H8; Adjustment Range: 21mm - 23mm (Cutting Diameter); Tool Flute Length: 69mm / 2.72"; Square Shank Size: 10.8mm / 0.43"; Overall Length: 195mm / 7.68". Provides durability, high hardness, good toughness, wear resistance, high temperature resistance, the ability to maintain sharpness over time. Wide Applications: The reamer is designed to accurately enlarge, smooth or finish holes in stainless steel, cast iron, aluminum, non-ferrous metals, plastic, and wood, widely used in hole repair work, pipe and fittings, woodworking applications. Hand Reamer: The reamer drill bit can be hand operated by use of a wrench, T-handle wrench, extension rod, drill chuck. Used for light cut, repair work, removing stock or simply for enlarging holes. Straight Flute Reamer: Allows chips and debris to escape easily from the hole, well suited for most applications in shallow cuts. Can achieve the required roundness, straightness, and concentricity of the hole. Uncoated Reamer Drill Bit: Features just the base substrate without any additional coatings, used on a wide range of materials. Tapping fluid or cutting oil can be used to lubricate the reamer and workpiece to help reduce friction and increase tool life.