• Manufactured from heat treated Chrome Molybdenum steel.• Designed to remove broken studs and bolts.• Reverse spiral design for maximum grip.• Recommended drill bit size (for pilot hole) etched on ea more→ch extractor, suitable for high torque applications.• Hex shaped head.• Contents: 1/8"(3.2mm), 5/32"(4mm), 3/16"(4.8mm), 7/32"(5.5mm), 1/4"(6.3mm), 9/32"(7mm), 5/16"(8mm), 11/32"(8.7mm), 3/8"(9.5mm), 13/32"(10.3mm), 7/16"(11.5mm), 15/32"(12mm), 1/2"(13mm), 17/32"(14mm), 9/16"(14.5mm), 19/32"(15.5mm), 5/8"(16mm), 21/32"(17mm), 11/16"(18mm), 23/32"(18.5mm), 3/4"(19.5mm), 25/32"(20mm), 13/16"(21mm), 27/32"(22mm), 7/8"(23mm).• Supplied in storage case.Manufactured from heat treated Chrome Molybdenum ste…