Engine Cold Crack Repair, Drill size (inches): 15/32 and 51/64

It’s made from ductile cast iron, which is a type of cast iron that’s more malleable and resistant to cracking than traditional cast iron.

G-Oversize HSS Tapered Tap. High-speed steel tap for installing “GO” series ductile iron plugs in GM/Detroit Diesel 71 & 92 engines and other casting repair applications.

HSS Tapered Reamer for Irontite Casting Crack Repair Prepares holes for D, D-1, D-1 Special ductile iron plugs, extending tap lifespan, especially when working with thick castings.

GO-4 sized Iron Plug with Drilled hole.