SCREW EXTRACTORS: Used for removing stripped screws, bolts and other fasteners LEFT-HAND FLUTES: Grip the metal firmly HEAT-TREATED CARBON STEEL: Provides superior durability ROLLED THREADS: Deliver more accuracy and are cleaner than machined threads RUST- AND TARNISH-RESISTANT DESIGN: Provides greater durability and accuracy LASER-ETCHED MARKING: Ensures size identification and won't wear off PRECISION MACHINING: Designed to ensure that flutes grip firmly