HAMMERHEAD HAIB30 30-pc Impact Driving Bit Set Impact-absorbing technology for optimal performance Bi-metal construction for increased durability 15X longer life than standard bits Magnetic insert bit holder for easy bit changes Magnetic bit collar holds screws securely for one-handed operation Impact absorbing technology for optimal performance Bi-Metal construction for increased durability 15X longer life than standard bits Magnetic insert bit holder for easy bit changes Magnetic bit collar holds screws securely for one-handed operation