The Makita® 18V LXT® Brushless Cordless 1/2” Mixer (XTU02, sold separately) is a cordless solution ideal for mixing drywall mud, plaster, drilling large holes and much more. The Drill Chuck (766016-2) is a direct replacement for the original drill chuck. The heavy-duty industrial ½” drill chuck is engineered for positive bit retention. The 766016-2 is constructed of durable metal for long life.