1、Cutting Holes on Various Materials: Step drill bit is ideal for cutting holes on various materials, including steel, brass, wood, plastic, etc. 2、Faster, Smoother and Cleaner: Two groove designs drive faster, smoother and cleaner cutting. Each step is clearly marked with the step depth diameter 3、Increase Durability and Bit Life: Made of high speed steel and Ti coating to increase durability and bit life, more durable 4、Laser Engraving Size: Laser engraving size provide accurate positioning assistance for accurate drilling 5、Deburring, Chamfering, Cutting or Reaming: Step drill bit can be used for deburring, chamfering, cutting or reaming, very powerful Item Type: Step Drill Bit Commodity Material: HSS (high speed steel) Tool Handle Size: 1/4in Drill Size: Approx. 4mm / 0.16in 6mm / 0.24in 8mm / 0.31in 10mm / 0.39in 12mm / 0.47in 14mm / 0.55in 16mm / 0.63in 18mm / 0.71in 20mm / 0.79in 22mm / 0.87in 24mm / 0.94in 26mm / 1.02in 28mm / 1.1in 30mm / 1.18in 32mm / 1.26in Function: Deburring, chamfering, cutting or reaming 1 x Step Drill Bit