Material and construction Made of quality 45# steel, delivering strength and hardness. Heat treatment and precision Adopting an integral quenching process, the drill sleeve is more impactresistant, provides longer life, and achieves higher precision. After three grinding passes, concentricity and surface roughness are . Hardness: HRC 4448; Accuracy: RA < 0.005 mm. Compatibility and usage For use with Morse taper shanks, taper shank drills, and reamers reducing. Applications and use scenarios Scenario 1: In a metalworking , pair with Morse taper shanks for precision drilling where strong, stable sleeve performance is required. Scenario 2: During reaming operations, use with compatible reamers to maintain tight tolerances and smooth finishes. Scenario 3: In manufacturing environments requiring reliable tool life and consistent concentricity for precision drilling and boring tasks.