The Rowvane Damaged Bolt Extractor Set removes bolts and studs that are snapped off, rusted solid, or rounded past the point a wrench can hold.
Each extractor is one piece: a thick hex body with a short, coarse reverse-spiral cone above it. The reverse flutes cut their own grip into whatever is left of the head — the harder the bolt resists, the deeper they wedge in, until the bolt turns and backs out with the extractor.
No welding, no cutting wheel, no drilling the whole bolt away and re-tapping the thread. The original thread stays intact.
Specifications
10PCS kit — ten sizes: 1/8", 5/32", 3/16", 7/32", 1/4", 9/32", 5/16", 11/32", 3/8", 13/32". All ten share the same 1/2" hex body, so one socket drives the whole kit.
25PCS kit — twenty-five sizes: 1/8", 5/32", 3/16", 7/32", 1/4", 9/32", 5/16", 11/32", 3/8", 13/32", 7/16", 15/32", 1/2", 17/32", 9/16", 19/32", 5/8", 21/32", 11/16", 23/32", 3/4", 25/32", 13/16", 27/32", 7/8". The larger extractors have larger bodies — hex sizes run 1/2", 5/8", 3/4", 7/8" and 1", so you will need sockets to match.
Each number is the diameter of the spiral tip and the pilot drill size it needs. The bolt being removed is always larger than this number.
Drive: socket on an impact wrench, ratchet or breaker bar
Material: Hardened steel