A bobbin threader, and cleaner are standard tools on any tyers bench. The package we offer includes one threader, and two bobbin cleaners. The cleaners will clear wax and materials out of most bobbin tubes, with the larger cleaner great for large or magnum bobbins. All tools measure 4 inches in length and come with a molded plastic ball on the end. Small Diameter: 1/32 in. Large Diameter: 1/16 in. The Bobbin Threader/Cleaner is made in the U.S.A.