1..Angle : 118 pointed angle, 90 stepped angle

2..Shank: Hex shank or straight shank

3.Surface finished:white finished, tin coated,black oxide

4.Package:1pc in one plastic box,skin card. Set:plastic box, metal box, wooden box

5.Drills up to 1/2" hole sizes with one bit

6.All shank with 1/4" quick change hex shank or 3/8" change hex shank prevents shipping

in drill chuck or bit extension.

HSS Step Drill Bits are perfect for drilling multiple-size holes in thin sections of metal, plastic and wood using a single bit. Each step drills does the work of many drill-bit sizes. Drills round holes in most metals (steel, brass, aluminum, copper) up to 1/8" (3.2mm) thick as well as in plastic  and wood.

and the hole size is easily determined by the diameter markings that are permanently laser-etched in the flute area.