IVY Classic's Mega-Magnetic Bit Holder with SDS Plus Shank 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. This Mega-Magnetic Bit Holder features a chrome vanadium steel shank with solid stainless steel body and is intended for rotary use only. Mega-Magnetic Bit-Holders are a unique IVY Classic product, patented in the USA. 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.