Product details:

Double your tool life or better with our high-precision End Mill holders. Manufactured to an H5 Bore Tolerance; H5 is the most accurate bore I.D., and provides improved T.I.R. for extended cutting tool life. Style Standard UNSPSC 27112809 Type CAT40 Standard Length End Mill Holder - Inch Projection Length (in) 3 Shank Size (in) 1/2 Mount Type CAT40 Model 22917