The BlueSpot 13 Pce Impact Driver In Case is manufactured from hardened carbon steel for increased strength and durability. The impact driver has a heavy duty soft grip handle to maintain grip during use. The bit selection is suitable for most bolts/screw types and includes : Phillips bits - # 1, 2, 3 & 4. Flat bits - 5, 6, 8, 10 & 12mm. Hex bits - 4, 5, 6 & 8mm. Ideal for the removal of seized or corroded bolts and screws when used with a hammer. Supplied with handy carry case for easy transport and storage.