Bore(") 1/4 For milling machines having 30-51 standard taper spindles
Accepts single and double end mills. (single end mill only for sizes over 7/8")
For milling machines having 40NMTB standard taper spindles
Hardened and precision ground. Drawbar End: #40- 5/8" -11
#40 Nmtb X 1/4" End Mill Holder For Milling Machines Having 30-51 Standard Taper Spindles. Hardened And Precision Ground. Accepts Single And Double End Mills. (Single End Mill Only For Sizes Over 7/8").