FeelGlad(TM)5pcs Titanium Step Drill Bits Set with Aluminum Case Set includes five standard SAE step drill bits with a two-flute design for faster, smoother cutting Made of super strong HSS steel for added durability and bit life. Drills holes in steel, copper, stainless steel, plastic, aluminum and other thin materials. Self-starting. Walking and center punch not required. Includes aluminum carrying case.