ITEM: 1/2 Head Diam, 9/16 Shank Diam, 6 Overall Length, Counterbore Pilot MSC. MANUFACTURER: MSC. BRAND: MSC. MANUFACTURER PART: 18611. 1/2 Head Diam, 9/16 Shank Diam, 6 Overall Length, Counterbore Pilot Bright Finish, High Speed Steel (MOQ1, Pkg Qty1)CATEGORIES: Maintenance, Repair and Operational (MRO) Supplies. Countersinks, Chamfer Mills & Back Chamfers. Countersink Accessories. Countersink Pilots. N/A. TOTAL RECYCLED CONTENT: 10.00%. POSTCONSUMER RECYCLED CONTENT: 1.00%. KEYWORDS: MSCCountersinks, Chamfer Mills & Back ChamfersCountersink AccessoriesCountersink PilotsN/A.