APPLICATIONS: Taper shank drills, taper shank cutters, etc. D25 applies to SBHA20-25 and SBHA25-25. Worth buying: can improve tool stiffness and extend blade life. HANDLE DIAMETER (HOLE DIAMETER EXTERIOR): approx. 25mm / 1 inch Convenient clamping, self centering, center height is more accurate center. MATERIAL: High quality 40Cr steel. High quality 40Cr material, high hardness, high strength, not easy to break. NOTE: We are confident that our product quality is 100% qualified. If there are any questions, please feel free to contact us. We will offer you the best service. Specification: Condition: 100% brand new Item type: CNC lathe tool holder ring Material: high quality 40Cr steel D40 Applicable tool holder: SBHA20 -25 SBHA25-25 Optional model: D25-MT1, D25-MT2, D25-MT3 Handle diameter (outer hole diameter): approx. 25 mm / 1 inch List packages: