Item Type: Reducing Drill Sleeve_x000D_Material: 40CrMo_x000D_Cylinder Wall Inner Diameter: Approx. 23mm / 0.91in_x000D_Cylinder Wall Outer Diameter: Approx. 40mm / 1.57in_x000D_Overall Length: Approx. 92mm / 3.62in_x000D_Suitable For Morse Hole: MTA1, MTA2, MTA3, MTA4 1WIDE APPLICATION: Reliable clamping increase stability, can be installed into inner diameter turning toolholders, twist drills, U drills, extension rods, etc. 2STRONG AND STABLE: Automatic positioning, high automatic positioning center hole, bring strong clamping and stable drilling 3EXCELLENT 40CRMO MATERIAL: High temperature quenching, tough and durable, the drill sleeve is made of 40CrMo material, first quenched and then formed, to ensure high hardness and toughness of knife cover 4SUITABLE FOR VARIOUS MORSE HOLE: Suitable Morse hole contain MTA1, MTA2, MTA3, MTA4, useful and practical 5IMPROVE RIGIDITY AND LIFE: Possess strong shock resistance, easy to store and maintain, greatly improving the rigidity of the bar, and improve the life of the blade 1 x Reducing Drill Sleeve 1 x Storage Box