4430 stainless steel making it ideal for the food, medical, aerospace and marine industries or for use in any acidic environment 6 point single hexagon sockets for a better grip Satin finish for a better grip when handling the socket Ball bearing recess on the female end to grip the ratchet Supplied with a clip rail with socket clips for easy storage as a set Designed and manufactured to DIN3120/3124 and ISO2725