555 Series Jeweler's Screwdrivers (Starrrett) Starrett jeweler's screwdrivers are made for relatively small and delicate work. Bodies made from steel and are nicely knurled and nickel plated. The blades are made from the best quality steel, properly tempered and nickel-plated. All blades are replaceable -- a slight turn of the knurled chuck securely locks the blade so it will not turn or come out. Made in USA and ISO certified.