Milwaukee SHOCKWAVE™ Impact Duty™ 12" Magnetic Bit Holder is expertly constructed from Custom Alloy76™ Steel to maximize wear resistance and is heat treated to ensure optimal hardness. This bit holder features a strong magnetic tip that provides a secure grip to the drive guide, while the C-ring design retains the insert bit firmly in place. Its durable 2-piece construction is built to withstand tough impacts, ing up to 30 times more life d to standard bit holders. Designed specifically for use with SHOCKWAVE™ Impact Duty™ Insert bits and Insert Magnetic Nut Drivers in various sizes (1/4”, 5/16”, 3/8”, 7/16”, 1/2”), this magnetic bit holder delivers reliable performance for demanding applications. Model Number: 48-32-4512