產品用途:當航空材料鑽孔完成後、需要用氣動工具做倒角擴孔、以便讓航空螺絲很精準與航空材料密切結合、不會產生風阻、減少航空事故。 產品材質: in - HSS unit:in ST1221JD-4 HSS Piloted 100° Countersink Order Code Flute Pilot DIA. Body DIA. Pilot Length Body Length Cutter Path Threaded Shank Threaded...