For your consideration is this lot of more than 20 assorted 3 and 4 flute end mill cutting bits.
The sizes range from 1/4″ up to 1″. Some are marked with only the size and M, others are by Cleveland, Union Twist drill, Morse.
These all appear to have been used, with most appearing to be in good to very good condition and at least two have been modified.
Please see the photos for more detail.