GOOD STRENGTH OF EXTENSION AND CORROSION RESISTANCE: 304 stainless steel material has good strength of extension and corrosion resistance in many environments ADVANTAGE: Countersunk head enables driving where it doesn't have sufficient space for wrenches GOOD CHOICE FOR: Ideal for use in confined areas where the head needs to be flush or below the USE FOR: Used for fasteners in home and office appliance, communication equipment, ship assembly or other machinery industry MEET YOUR DAILY USE: 9 optional common lengths are enough to meet your daily use, Manufacturer: Hilitand