Impact driver 3/8"D with 1/4" and 5/16" hex bit holders for loosening over-tightened, rusted or seized fasteners. The driver has a knurled shaft for grip and has a durable black finish, it delivers a strong, sudden rotational force and forward thrust when struck with a hammer to release stubborn fasteners with ease. A quality set that includes a selection of Phillips and Flat bits, presented in a blow mold storage case. Set includes: 3/8"D Impact driver, 2 x bit holders: 5/16" & 1/4".1/4" shank bits: Flat (22mm long): 4, 6mm; Phillips (25mm long): Ph1, Ph2, Ph3. 5/16" shank bits: Phillips (32mm long): Ph1, Ph2, Ph3; (38mm long): 10-12, 14-16mm. Bits manufactured from chrome molybdenum.