Craftsman Hand Impact Driver, 3/8-Inch Set (Cmmt14104). Designed to convert the force of a hammer blow into 200 foot pounds of torque, the Impact Tool Set loosens frozen fasteners quickly and easily. By using the included bit set, the hand impact driver can be used to both loosen and tighten Philips and slotted fasteners, as well as drive 3/8-inch sockets. VERSATILITY: 5 bits for slotted and Phillips fasteners EASE OF USE: Easily loosens frozen/rusted screws, nuts or bolts with the hand impact driver EFFICIENT: Tightens fasteners without stripping DURABILITY: Creates up to 200 foot pounds of torque when struck with a hammer FLEXIBILITY: Loosen and tighten Philips and slotted fasteners, as well as drive 3/8-inch sockets. Full Lifetime Warranty, refer to "Warranty Support" section below for full details