Feature 1Perfect for removing stubborn screws and broken or damaged bits, studs, etc. 2Cuts off rusted, cross-threaded or rounded-off nuts without damaging bolt threads. 3Forged and hardened chrome-vanadium Steel for long life. 4Suitable for most standard variable-speed bits. 5Portable plastic box for easy to carry.Features: Perfect for removing stubborn screws and broken or damaged bits, studs, etc. Cuts off rusted, cross-threaded or rounded-off nuts without damaging bolt threads. Forged and hardened chrome-vanadium Steel for long life. Suitable for most standard variable-speed bits. Portable plastic box for easy to carry. Specification: Material: HSS4241 Color: Silver 5 pieces screw extractor kit: Used to remove items with shear heads or circular grooves Turn the extractor counterclockwise to tighten and loosen the broken studs in the hole. 5pcs/set 40CRV steel extractors Portable plastic box Size: No.1 - 3mm-6mm No.2 - 6mm-8mm No.3 - 8mm-11mm No.4 - 11mm-14mm No.5 - 14mm-18mm 2 pieces nut splitter set: Used to remove damaged or corroded nuts without damaging the thread of the bolt Chrome-plate body Chrome-vanadium steel blade Nut size: 12mm-16mm and 16mm-22mm Package List: 12pcs/set * Nut Splitter Set