IVY Classic 60085 31 Piece Mega Magnetic Driver Set. Mega Magnetic Bit Holder - 2 powerful magnets create 40x the pulling power of an ordinary magnetic bit holder. Patented in USA. Magnet #1 holds and magnetizes the bit while magnet #2 powerfully holds your fastener in place! (See illustrations). High precision, 48 tooth ratchet screwdriver and 72 tooth ratchet handle driver with co molded rubber grips for added comfort. Chrome vanadium steel nut drivers with lobular design and 1" hollow shafts. Sizes: 1/4", 5/16", 3/8", 7/16", 1/2". 20 Phillips, slotted, square, and Torx S2 tool steel insert bits. Rockwell Hardness HRC 60 - 64. Includes 1/4" Sq/Hex Quick-Change Adapter for your power drill along with 1/4" Sq/Sq and Sq/Hex Adapters for the ratchet handle driver. Ratchet Screwdriver: empty plastic 10-bit magazine included inside handle. Packed in molded plastic carrying case with a clear plastic clam shell package. Meets A.N.S.I. specifications.