51/64" Cobalt Split Point Stub Drill Bit Live and the ball/socket piece is

and the ball/socket piece is made from 8660 nickel-chromium-molybdenum steel

Part Number: 100C900SHB307G

and the tightly mated fit results in a bit that won't loosen over time or under stress

Part Number: 43C3600RODSS

Part Number: BIT-DWDRSD3/8X21/32

51/64" Cobalt Split Point Stub Drill Bit Live and the ball/socket piece isProduct Description Cobalt screw machine drills (also know as stub or stubby drills) are manufactured to Aerospace Standard 907. The 135 degree split point is self centering and reduces thrust. Ideal for portable or machine drilling. Short, rugged construction performs well in a broad range of materials in the iron and steel families. Screw machine drills are popular in the automotive and construction industries. They are often used in screw machine