3 Pc Drill Bit Set Pin Vise Chuck Tool for Flex Shaft This is a new quick pin chuck with 3 collets Comes with 3 collets that can hold a variety of drill bits, burs, saw blades, files, etc This can be used in hand drills or electric drills The quick pin chuck measures approximately 2 1/16" x 1/2" (52 x 13 mm) Each collet measures approximately 15/16" x 5/16" (24 x 8 mm)