Makita B-42357 Impact Gold Ultra-Magnetic Insert Bit and Socket Set, 19-Piece (Discontinued by Manufacturer) Impact Gold insert bits last up to 10X longer than standard insert bits Two-piece bit holder design is engineered to allow the torsion technology to fully activate High-quality steel engineered for use with impact drivers Insert bits feature precision-fit tip engineered to prevent "cam-out" and stripping Designed exclusively for high-torque impact drivers