The Facom SC.256.4 model measuring 10cm long and has a conical tip of 2.5mm high for a 4mm diameter at the top (about 80 ° angle). The tool is made of stainless steel, chrome vanadium steel. The manufacturer announces a hardness 52-58 HRC. By its self-lubricating properties and high hardness, finishing with a chemical nickel plating allows in principle a marking "clean" on a wide variety of metals.
After a few weeks of use, needle effectively allows a clean working on soft metals (aluminum), but also on the standard quality steel (square and flat steel like "DIY stores"). In the latter case, the labeling is obviously lighter (SC 256.6, 256.8 or 256.10.