Walter SST+ drill bits are now made with cobalt blend to drill even more holes faster in any type of material.Feature:"High flow" flute design, Back tapered body Drills more holes, faster, Heavy-duty fully ground body construction, Special bronze SST surface treatment Application:All portable drilling applications Drilling of round surfaces Drilling with stationary machines Material:All portable drilling applications, Drilling of round surfaces Drilling with stationary machines Tips:Large diameter bits; low speed, high feed Small diameter bits; high speed, low feed * All Pictures Shown Are For Illustration Purpose Only. Actual Product May Vary Due To Product Enhancement.