Need to cut or repair threads? This uxcell set has you covered for M4 x 0.7 metric threads. It includes a spiral flute tap (for making internal threads in a hole), a round die (for cutting external threads on a rod), and a 3.3mm cobalt high-speed steel drill bit (to drill the pilot hole before tapping). The tap and die are made from hardened steel with a black nitride coating for extra wear and corrosion resistance. The spiral flute design on the tap helps remove chips upward for cleaner threading, especially in blind holes. The drill bit is M35 cobalt steel, making it tough enough for stainless steel. Remember to use cutting oil for better results and longer tool life. This set is great for general workshop use on materials like aluminum, steel, stainless, bronze, and hard plastics. Whether you're working on a car, bike, or DIY project, having a good tap and die set is super handy. Just note, you'll need a tap wrench and die holder (not included) to use them.