Check the listing for details. NICE! CRITERION 3/4'' BORING HEAD w/ CAT40 SHANK - #203D. Condition: Used. Listed at 389.99 USD. Model #: 203D. This is a 3/4" Boring Head w/ CAT40 Shank. Shank: CAT40. Made in the U.S.A. by Criterion. Cross Hole Capacity: 3/4". Capacity: 3/4". Distance Between Hole Centers: 15/16". Head Length: 3-3/16".