Milwaukee Shockwave Impact Duty Magnetic Bit Holders are engineered for extreme durability and Up to 30X Life. Made from proprietary steel and heat treated to control hardness, the Shockwave Impact Duty magnetic bit holders feature a powerful magnet allowing for a secure grip and unyielding bit engagement. The 2-Piece construction of the holders is the optimal assembly for abusive applications.FEATURESProprietary steel and heat treat process for maximum strength and durabilityHeavy duty construction for fastening capabilities in all impactsGeometric design provides the shock absorptionForged tips for maximum gripUse with Milwaukee Shockwave Impact Duty Insert BitsMagnet holds fasteners to the drive guideC-ring retains the insert bitCustom alloy 76 steel maximizes resistance to wear and shockFor use with 1" insert style driver bits