5 piece, #1 - #5, spiral screw extractor set, designed to remove broken studs, bolts, socket screws & fittings, spiral flutes are designed to embed themselves deeper into the metal as you turn the tool, as the fastener resistance increases the extractor's grip increases, #1 removes bolts & screws 3/8"- 5/8", use 19/64" drill bit, #2 removes bolts & screws 5/32"-7/32", use 7/64" drill bit, #3 removes bolts & screws 7/32"-9/32", use 5/32" drill bit, #4 removes bolts & screws 9/32"- 3/8", use 1/4" drill bit, #5 removes bolts & screws 3/8"- 5/8", use 19/64" drill bit.
