HIGH HARDNESS AND LONG DURABILITY--Constructed of chrome vanadium steel, high hardness and long durability. APPLY FOY--Can be connected to electric drill, charging electric drill or manual wrench. CLEVER DESIGN--Equipped with locking and magnetic devices to ensure that the socket will not fall. PRACTICAL--Apply to all electric drill and socket wrench, which allows to reach unreachable or tight spaces. CONVENIENCE--Lightweight, convenient to connect this socket to 1/4inch hex screwdriver., Weight: 0.330693393 Pounds, Manufacturer: Hilitand