Ideal for processing sheet metals even thin sheets without deformation for all common industrial metals thermoplastics and thermosetting plastics the bits use a special cutting geometry for drilling and deburring without pre drilling with a 600 higher surface durability due to tin coating thus significantly increasing the service life includes 1 step drill increment in 1 mm increments 2 step drill steps in 2 mm steps size 1 3 12 mm 1 mm steps size 2 4 12 mm size 3 6 20 mm