Dear，Pls leave a massage to tell us what design (Color) do you want.thank you.

For milling machine， lathe， drilling machine， wood working machine.The shank with scrw can be tight and flex for you.Should work with power drill， here is not included.Specification:Capacity:0.6-6.5mmMount Thread:3/8-24UNFInterior Hole Diameter 6mm/ 0.24"Exterior Hole Diameter Small: 30mm/ 1.2"， Big: 23mm/ 0.9"Total Height 4.7cm/ 1.85"Chuck Key 55 x 35mm/ 2.2" x 1.4" (L*W)Main Material: MetalColor Black， Silver TonePackage Included:1 x 0.6-6.5mm Drill Chuck1 x Chuck Key1 x 1/4" hex shaft