- Adjustable Hand Reamer Size: Cutting diameter adjustable from 19 to 21 mm, overall length 181 mm. This enables quick size changes without tools and ensures the hole can be finished to the exact diameter needed. - Wide Applications: Designed for accurate reaming on metals including A3 steel, alloy steel, cast iron, cast steel, aluminum, and other metal materials. Suitable for a range of machining tasks. - Straight Flute Design: Straight flute directs chips into the flutes, supporting smooth cutting and effective chip evacuation for shallow cuts. - High Speed Steel Construction: Made from high speed steel (HSS) for a balance of hardness and toughness, delivering good wear resistance and long tool life. - Key Benefits: precise diameter control, versatile material compatibility, and reliable performance in finishing reamed holes. - Practical Use Scenarios: - Reaming holes in A3 steel shafts or fittings to achieve exact diameter tolerances. - Finishing holes in aluminum components such as housings or brackets for accurate fits. - Reaming cast iron or cast steel engine parts that require precise hole dimensions.