M-1505-P Apex Replaceable Bit Driver For 1/4” Insert Bits, Magnetic allow nutrunning in all types of applications. Quality design and construction give Apex nutsetters a long service life and durability. With M-1505-P Apex Replaceable Bit Driver For 1/4” Insert Bits, Magnetic you are assured of high quality and industrial strength. M-1505-P Apex Replaceable Bit Driver For 1/4” Insert Bits, Magnetic are specifically designed and manufactured for high impact use, and made from a tougher and more ductile alloy steel which is then heat treated for extra durability.