Specially designed to remove the broken head of the glow plug.Material : Cr-Mo + S45CSize : M8 x 1.0 M10 x 1.0, 1.25 M3 screw (180L) M4 screw (180L) M3 tap : 0.5 x 100L M4 tap : 0.7 x 100L Drill : Ø 2.5 x 120L, Ø3.3 x 140L