A set of three high speed steel stepped drill bits for producing precise parallel-sided holes in metals, fibreglass and other plastics. Size range covered by the set is 4mm to 30mm diameter in 2mm steps (max. depth 4mm). Titanium nitride coated for increased wear resistance. 8mm shank.
12 October 2017
Good but expensiveThese work well for me in Aluminium or Plastic. A good spray of cutting fluid improves their performance on metal and should reduce wear.