Specs Collet Series: ER20 Material: 52100 Bearing steel Number of Pieces: 12 Sizes: 5/32" - 1/2" increments by 1/32nds Collapse Range. Actual item will match description. This item is in the category "Business & Industrial\CNC, Metalworking & Manufacturing\Workholding & Toolholding\Workholding\Collets\16C Collets". The seller is "cutting_edge_tool" and is located in this country: US. This item can be shipped to United States.