FROM THE MANUFACTURER:

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.