6 Drill Bit Adapter Chucks Jewelers Tools 4 Drill Bit Micro Chucks. This is a new set of 4 drill bit micro chucks. Great for drill bits, burs, polishing bits, etc. All include 1 collet. Each has a 1/8" shank. Drill Bit Adapter Chuck. This is a new drill bit adapter chuck. Great for drill bits, burs, polishing bits, etc. Includes 2 collets. It has a 3/32" shank. We work hard to update our descriptions and pictures of our merchandise. As part of a process of ongoing innovation by our suppliers, newer versions of the item shown may be shipped before we are able to complete an update. As a result there may be a slight variation in color and design.