Specification: size: 5.6 mm / 0.22 inches, total length: 90 mm / 3.54 inches, shaft diameter: 5.5 mm / 0.22 inches, groove length: 20 mm / 0.79 inches, number of grooves: 6, grinding type: straight, shaft type: round. audclass class : D4Material: High Speed Steel, Cobalt M35Package: 2Pcs x Chuck ReamerDescription:1. High speed steel cobalt M35 tool: good for most general applications, provides a combination of hardness and toughness for wear resistance.2. Uncoated tool: only features the base substrate without additional machining or coatings, suitable for a variety of applications.3. ROUND SHANK - Allows for use with a variety of tool holder systems. Should be held in a high-quality tool holder to prevent the reamer from slipping off at high torque.4. Straight Cutting Edge:Allows the accumulation of chips in the grooves during cutting and is suitable for most applications on flat cuts.5. Straight Flute Reamers: Good for use in through or blind holes without interruptions such as keygrooves. (Through holes extend through the entire workpiece, while blind holes are not continuous.)6. Tension Reamers: Designed for precise grating in most materials with total types of machinery, including screwdrivers, revolving benches, drills and machining centers.