R-8 Shank 1-1/2" x 18 T.P.I for Boring Head Bridgeport Milling
R 8 shank for Boring Head. R 8 shank For Boring Head. 1 R-8 Boring Head Shank. Can be used in any boring Head with 1-1/2' x 18 T.P.I Thread. Draw Bar Thread is 7/16" x 20 UNF. Made of Carbon Steel.