Our SHOCKWAVE™ Impact Duty™ Magnetic Bit Holders are engineered for extreme durability and up to 30x life. The MILWAUKEE magnetic bit holders are made from proprietary steel, heat treated to control hardness. The SHOCKWAVE™ magnetic bit holders feature a powerful magnet, providing you with a secure grip and unyielding bit engagement. Each bit holder has a 2-piece construction for optimal assembly in abusive applications. Our SHOCKWAVE™ Impact Duty™ Magnetic Bit Holders can now be used with with Milwaukee SHOCKWAVE™ Impact Duty Insert Magnetic Nut Drivers (¼”, 5/16”, ⅜”, 7/16”, ½”).