Sierra American 1/2" Precision Boring Head Arbor. Precision Sierra American Boring Head Arbor With 1/2” Straight Shank. Features Fine-Adjustment Brass Knurled Collar And Slotted Micro-Adjust Shaft. Used To Mount Boring Heads And Facing Heads In Milling Machines And Drill Presses For Precision Hole Sizing And Counterboring. Made In Covina, California, USA. Industrial Grade Machining Tool. *MADE in USA* *PICKUP ONLY*
