Drill Size 1/4", Made in the USA
For Bolts/Screws - 9/32" - 3/8", 1/8" Pipe
$11.02 /Each
To remove the broken threaded part: Drill a hole in the end of the broken part (left hand spiral heavy duty drills are recommended for this drilling operation), insert extractor, then turn counterclockwise using a wrench on the exposed end of the extractor.