This robust 1/2"D impact driver is complete with bit adaptor and bits, suitable for loosening screws or nuts that have rusted, threaded, or over tightened. The impact mechanism has a two-way clutch adjuster for clockwise and anti-clockwise use and the heavy-duty outer sleeve is knurled for grip. This driver turns and engages with one hammer blow to deliver a large amount of torque. A simple, effective solution for releasing stubborn fasteners. This impact driver can be used with 1/2" sockets or 5/16" extractor bits. Features and Benefits Set includes: 1/2""D impact driver, 1/2""D bit adaptor & bits 5x bits, 5/16"" (8mm) shank: Phillips Ph2, Ph3, Ph4; Flat 8mm, 10mm Two-way clutch, can be used in forward or reverse Supplied in a robust metal storage case Can also be used with 1/2""D socket accessories