The Irwin IWAF36212 Power Bit is the fastener that you will want to keep on hand. It can be used with a variety of tools, including an impact wrench or drill. The power bit has a 1/4 in hex shank and a 2 in overall length. Its 1/2 in input drive size and 1/4 in output drive size make it compatible with a number of tools, including an impact wrench or drill. This power bit is designed for use with steel fasteners only. It features rust preventative manganese phosphate finish which helps to protect against corrosion and pitting. With its durable construction, this Irwin Power Bit will help you complete your projects quickly and efficiently.