usa 5pcs large metal step drill bit set hss multiple hole 50 sizes w/ case

this is the new hss steel large step cone drill titanium bit set hole cutter, which is made from hss steel, and with the titanium coated to reduce friction and heat. it is very suitable for using to cut holes in a variety of materials including steel, brass, wood, plastic, etc. color: as the picture shown. material: high speed steel with cobalt coated. this set replaces 50 individual drill sets .made by long life high speed steel. self starting - no need for a pilot hole.