Breakheart Tool Company's 3/8 Inch Diameter Mandrel with 5/8 Diameter Straight Shank
Great for turning Duck and Game Calls on lathes
.Made with Pride in America from 12L14 steel they can be used as is or you can easily machine them for your custom needs
Has 5/8 Diameter Shank for mounting in a collet or chuck.
Work Holding end is 3/8 diameter x 2-1/2 inches long with 6 slots cut to a depth of 1-3/8 inches
Will expand .005 - .010 inches