Manufactured from a thermal treatment of chromium molybdenum steel.
Achieves rapid extraction with the aid of the helices acting as screw.
Measurements:
No. 1 1/8" - 1/4" (M 3-6)
No. 2 1/4" - 5/16" (M 6-8)
No. 3 5/16" - 7/16" (M 8-11)
No. 47/16" - 9/16" (M 11-14)
No. 5 9/16" - 3/4" (M 14-18)