IVY Classic's Mega-Magnetic Bit Holder features two powerful magnets which create 40x the pulling power of an ordinary magnetic bit holder. One magnet holds and magnetizes the bit while the second magnet powerfully holds your fastener in place. Mega-Magnetic Bit Holders are designed to withstand the high torque of impact drivers. Mega-Magnetic Bit-Holders are designed with one-piece stainless steel construction with an aluminum slide and are a unique IVY Classic product, patented in the USA. These bit holders work with all 1" hex insert bits. IVY Classic Industries manufactures an extensive line of bit holders in a variety of sizes and lengths. IVY Classic Industries is dedicated to producing a comprehensive, quality line of power tool accessories and hand tools.