The diamond milling bit with a blue band has a medium grit and is suitable for strong and rough skin, and can work even faster on normal skin. The cylinder milling bit with a flat head can be used by both left-handed and right-handed individuals, and you should set your electric nail drill to around 12,000 RPM. The blue diamond milling bit with a cylinder is for removing dead skin cells around the nails and cuticles; the flat head is perfect for cutting through rough and hard cuticles that are firmly attached to the nail plate. Preparing overgrown cuticles for removal, preparing cuticles for removal, cleaning the sidewalls, and roughening the nail plate are all no problem for this diamond milling bit. Do you want to soften cuticles before removing them and dead skin cells? Use Klear's gel, Klear Prep It Up is a handy gel that softens and disinfects cuticles and dead skin cells. The ideal prep for natural nails that allows you to easily push back cuticles and remove dead skin cells. The raw material of this metal is Swiss hardened stainless steel, which guarantees quality and allows you to work with the highest quality in your treatments. Furthermore, its durability is higher than any other diamond milling bit!