Sai Truman Enterprises offers Pin Chuck Set with Three Interchangeable Collets. Sai Truman Enterprises supplies machine tools. Pin Chuck Set with Three Interchangeable Collets is a very useful reducing chuck used for holding drills too small to be held by a regular chuck. Pin Chuck Set with Three Interchangeable Collets is gripped in the larger chuck already on the machine by means of the back shank. It is supplied with three interchangeable collets for holding small drills in varying sizes.