4 Pcs Drill Bit Adapter, 1/4 to 4mm Bit Adapter, Hex to 1/4 Drive Adapter, Magnetic Drill Adapter for Sockets and Precision Bits Set Screwdriver Converter. The drill bit adapter is made of high quality carbon steel, with high hardness and durability, and built-in magnetism to help you fix the micro drill bits in place, allowing you to work more efficiently.
