FTG USA 6 Piece #6 (9/64") Counter Sinker drill bit set with 1 Extra Bit 9/64”, 1 Hex Wrench and 1 Depth Stop Collar, and 6 Pcs #6 (9/64") Replacement Drill Bits Only. Adjustable Wood Countersink Set feature the best tapered drill bits 3rd Party Tested HSS M2, by far the most popular High-Speed Steel, Grade 6542, confirmed in Certificate of Analysis Report, has superior properties, including high toughness, wear resistance, and good cutting retention. Logo brand is laser printed on each countersink shank making it easier to differentiate this quality brand from others. Counterbore size 3/8", Plug size 3/8". Super sharp, exceptionally durable, easy to use, and built to perform well in both hard and soft woods. Drill, countersink and counterbore in 1 step. Top quality material #45 Carbon Steel adjustable four-cutter counter bore chamfer angle 82-degree, attachment that cuts fast and clears chips quickly for fast, smooth countersinking applications. The counter bore feature attaches flats on shank with 2 hex screws for a secure fit and can be adjusted for controlled pilot hole depth providing a clean finish for more polished final products. This product is designed in New Jersey, and professionally manufactured in China at FTG USA specifications. Packaging set combination/design protected by US Copyright Office.