For sale is a Group of (37) No.30 NMTB (National Machine Tool Builders) Tool Holders for use with milling machines, CNC mills, etc. The slots in the tool flange (where the driving dogs of your mill fit when the tool is in the spindle) are equally sized, and approximately 5/8" wide. Many of the holders are labeled "Erickson". There are straight-shank holders up to 1", (2) sizes of collet type holders, shell-mill holders, and a Lyndex drill-chuck holder in the group. ER and DA type holders also. NOTE: All of these tool holders appear to be in good condition (including the tapered portions). Please review the photographs, and do not hesitate to ask me any relevant questions regarding this listing. The wooden board the tool holders are sitting on IS NOT INCLUDED with the holders.