HAMMERHEAD HACB120 Drilling & Driving Bit Set, 120 Piece Patented Universal Bit Grip Collar fits all common screw driving bits of 2" or longer; even double-ended bits. 4X Stronger Magnetic Force hold screws securely for one-handed operation. Convenient Clear-View Carrying Case keeps all of your bits well organized and easy to access. Patented Universal Bit Grip Collar fits all common screw driving bits of 2" or longer; even double-ended bits. Convenient Clear-View Carrying Case keeps all of your bits well organized and easy to access.