3 bits are included in this listing: 3.8mm, 4.5mm, and triwing which you can use to open many systems and cartridges (see list above).

Made from high quality CRV 6150 steel, much better quality than its ugly cousins "hardened", "tempered", or "carbon" steel ... you know, the ones that disposable tools are made of.

Great tools that are made right.