For sale is a Micro-Adjustable Boring Bar Holder. R-8 Taper shank (fits Bridgeport milling machines). Micro-adjustment with 0.001" reading dial. (2) 3/4" Diameter holes in the face and (2) 3/4" diameter holes in the sides for fitting your tool. Set screws for locking-down the adjustable head. 7-3/4" Overall length of holder (not including perishable boring tool). Made in Taiwan. NOTE: The adjustment on this boring bar holder feels very smooth.