Features and Benefits:Chromium-Molybdenum Steel (CRMO) construction for added durability and long life;3-3/16" deep for longer reach and the ability to fasten over longer threads;Locking hole keeps the socket securely attached to the impact driver;Laser etched for easy identification;High strength 6-point drive sockets for Xtreme torque applications;Black oxide coated to resist corrosion for longer socket life;1/2" drive designed to handle the most demanding applications;For fastening nuts onto bolts in high torque applications;Sockets are ideal for use with impact drivers (with adapter), impact wrenches and ratchets;Makita Deep Well Impact Sockets are the perfect accessory for a high torque impact wrench when taking on demanding applications like driving large lags through support beams, setting anchors, and removing stuck weather-rusted nuts. Makita Deep Well Impact Sockets are constructed with Chromium-Molybdenum Steel (CR-MO) and black oxide coated for longer life. The sockets have a 3-3/16” length for longer reach and the ability to fasten over longer threads. They are engineered for use with high-torque impact wrenches, and can also be used with impact drivers (adapter required, sold separately) and ratchets. Makita Deep Well Impact Sockets are ideal for tilt-up contractors, formers, framers, deck builders, and more.