This is a wedge proof screw extractor set made by T&E Tools.
It is designed to remove broken fasteners without breaking or
jamming. It is capable of turning broken fasteners out while
permitting the highest torque without expansion..They are made from
C4150 alloy steel. They are supplied in a storage case.
Drill Sizes included: 1/8", 5/32", 3/16", 7/32", 1/4", 9/32",
5/16", 11/32", 3/8", and 13/32"
All Extractor Lengths: 1 3/8"