IVY CLASSIC'S 42 PIECE MEGA-MAGNETIC TAMPER RESISTANT SCREWDRIVING SET features the patented 3” Mega-Magnetic Bit Holder and a 3” Magnetic Quick Release Holder (1/4” Power Hex Shank), along with removable trays of ACR Phillips, Slotted ACR, Pozidriv, Phillips/Square, Tri-Wing, Spanner, Hex Tamper and Torx Tamper Bits. Insert Bits are S2 Tool Steel strength (Rockwell Hardness 60-62)The Mega-Magnetic Bit Holder features TWO POWERFUL MAGNETS which create 40X THE PULLING POWER of an ordinary magnetic bit holder. The Mega-Magnetic Bit Holder, Magnetic Quick Release Holder and all Bits are designed to withstand the high torque of DRILLS and IMPACT DRIVERS. Sturdy plastic lockable case contains bits which are held in innovative hinged flip-up trays for very easy access and removal of bits. Trays can snap lock at 45° or pivot to any desired angle. SET CONTENTSACR Phillips: #1 (2 pc.), #2 (4 pc.), Red. #2, #3Slotted ACR: #6-8, #8-10, #10-12Pozidriv: #0, #1, #2, #3Phillips/Square: #2Tri-Wing: #1, #2, #3Spanner: #6, #8, #10, #12Hex Tamper: 3/32", 1/8", 9/64", 5/32", 3/16", 7/32", 1/4", 5/16"Torx Tamper: TT8, TT9, TT10, TT15 TT20, TT25, TT27, TT30, TT40