High Speed Steel Tool: Good for general use, offering a combination of hardness and toughness for wear resistance. Uncoated Tool: Only the base substrate without any additional treatment or coating, suitable for many applications. Hand Reamer: The reamer can be operated by hand using wrenches and used for light cutting, repair work, stock removal or simply to enlarge holes. Straight Flute Tool: Allows chips to be collected in the flutes during cutting, well suited for most applications in shallow cuts. Heat resistance, long service life. Application: Designed for precise reaming in A3 steel, alloy steel, cast steel, aluminum and other metal materials. Product Description Size:19-21mm Description: High speed steel tool is good for general applications, offering a combination of hardness and toughness for wear resistance. The hand reamer can be operated by hand using wrenches and used for light cutting, repair work, stock removal, or simply to enlarge holes. The straight flute tool