The Milwaukee Shockwave 3 in. Impact Duty Magnetic Bit Holder is engineered for extreme durability and up to 30X Life. The Milwaukee magnetic bit holder is made from proprietary Custom Alloy76 steel, 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 and a C-ring to retain the insert bit. The drill bit holder has a 2-piece construction providing optimal assembly for abusive jobsite applications.Find the MLW BIT HOLDER 3 at Ace.