Quantity: one set Specification: MT2-B16 Well designed: card capacity 0-16mm; good metal texture, beautiful surface, easy to tighten the outlet corrosion; convex and concave, so that the front cover can be manipulated effectively and reduce hull shaking. Ease of use: Keyless design, manual tightening and loosening for faster and easier tightening and loosening; When machining, the chuck clamping force is proportional to the increase in cutting force Durable steel material: the quick release boring chuck is made of No. 45 steel high quality, strong and durable, with good precision and hardness.After special high temperature quenching treatment, it has a long service life Generate: Unique alignment makes torque easier for a greater clamping force around the handle; widely used in a wide variety of drilling machines, milling machines, lathes, drill presses and power hand tools Good quality product