As an Amazon Associate, we earn from qualifying purchases. OM489A11 Counterbore (Pilot) Omega Technologies . OM489A11 Gallery Attributes Brand name, Manufacturer name, ManufacturerOmega Technologies Extra Product NameOM489A11 Counterbore (Pilot) keywordsAircraft, counterbores, spotfacers, fasteners, pilot moq, multiple, tierMinQty11 MPN, SKUOM489A11 qtyInStock0 snippetAircraft counterbores or spotfacers are used to assure a flat seating surface for fasteners or mating parts that are 90 degree to the axis of the hole. Pilot Diameter: 5/16'' Shank Diameter: 3/32'' tierPrice16.75 Distributor offers SellerSKUMOQIn stockMultiplePrices omegatec.comOM489A11111 @ $6.75