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High Precision 2" Boring Head Head size: 2" Boring bar Hole: 1/2" Cross Hole Dia: 1/2" Maximum Offset: 5/8" Thread: 1-1/2"-18 Graduations: 0.001/0-50 Center Distance bt 2 bottom hole: 0.60" MT2 Shank end thread 3/8-16 The carbide tipped 9-piece boring bar set includes three different length boring bars each for minimum bores of 5/16", 7/16", and 9/16". The bore depth ranges from 3/4" to 3". The heat treated, alloy steel shanks are held to 0.000 to -0.0005" from the nominal diameter. Bar holder moves freely and smoothly. Design assures superior rigidity for chatter-free boring and precise hole size accuracy. Hardened and Ground adjusting screw designed for long lasting and trouble free use.