These bits are approximately 4" in length. They are cobalt, originally from the aircraft industry, precision sharpened and long lasting. They come with a mount for a precision chuck. Chucks are sold separately. Available sizes from 0.098" (#40) to 0.377" (V)
PLEASE NOTE: This tooling came from a large aircraft manufacturer which was closing its shop. Some of the items are slightly used, which means they are like new, reconditioned and usable. We will replace any items or refund any purchase which the buyer finds unsatisfactory.