This set contains a complete selection of 17 (14 for the metric set) Sherline WW collets, including a blank, 3/4"" and 1"" pot chucks with dowel pin, an adapter, drawbar and a knockout bar. It is packaged in a high quality wood box constructed with finger joint corners that has a brass latch and hinges. A machined wood insert locates each part, plus a drawing in the lid reminds you where each part goes to keep things organized. Extra holes are provided should you want to add additional collets to suit your particular needs. This is a handsome and useful package for the serious miniature machinist. The set contains: WW collet adapter, drawbar, knockout bar, blank WW collet, 3/4"" collet pot chuck, 1"" collet pot chuck and 1/8: clamping pin. The inch set includes the following 17 collet sizes: 1/16"", 5/64"", 3/32"", 7/64"", 1/8"", 9/64"", 5/32"", 11/64"", 3/16"", 13/64"", 7/32"", 15/64"", 1/4"", 17/64"", 9/32"", 19/64"", 5/16"". The metric set includes the following 14 collet sizes: 1.5 mm, 2.0 mm, 2.5 mm, 3.0 mm, 3.5 mm, 4.0 mm, 4.5 mm, 5.0 mm, 5.5 mm, 6.0 mm, 6.5 mm, 7.0 mm, 7.5 mm, 8.0 mm."