h2. Large Diameter * Finish bore full range of extension base. * Uses modular extension base to minimize tooling inventory. * Diameter adjustment of .0001 with Vernier scale. * .040 per revolution, .001 (.02 mm) on diameter dial. 2007-01-17T12:17:22+00:00 false false 115 true false Large Diameter Finish bore full range of extension base. Uses modular extension base to minimize tooling inventory. Diameter adjustment of .0001 with Vernier scale. .040 per revolution, .001 (.02 mm) on diameter dial. INCH – BORING Precision Finish Boring Heads 6.00" to 21.89" (152.4 mm to 556 mm) Bolt on Boring Ring Adapter, Precision Finish Boring - Large Diameter, Precision Finish Boring, Boring, Products, Extension Base with Finish Head, Precision Finish Boring Heads 6.00" to 21.89" (152.4 mm to 556 mm) Bolt on Boring Ring Adapter 367 30 false precision_finish_boring_heads_6_00_to_21_89_152_4_mm_to_556_mm_bolt_on_boring_ring_adapter 2007-10-04T18:46:35+00:00 true