These screw extractors are for removing broken screws, bolts and threaded parts. The extractor is inserted into a pre-drilled hole and the broken part is backed out with a wrench. Also for turning threaded pipe sections. Set contains
#1 for screws 3/32''-5/32''
#2 for screws 5/32''-7/32''
#3 for screws 7/32''-9/32''
#4 for screws 9/32''-3/8''
#5 for 3/8''-5/8'', 1/8'' abd 1/4'' pipe
#6 for 5/8''-7/8'', 1/2'' pipe