Best Seller | Micro 100 Boring Head Holder 3/8 Four Flats TH-208 Boring Head Holder TH Overall Length 2-3/4 in Inside Dia. 3/8 in Bore Dia. 3/8 in Shank Type - Machining Straight Shank Dia. 3/4 in For Use With Standard Shank Tools in Lathe Applications Collar Dia. 7/8 in Finish - Machining Black Oxide more | | $106.02 FREE shipping go to store |