For normal use - outer thread R1/2" (often referred to as Continental or Belgian ) - length 75mm (2.31/32") - drill base made of steel - covered with protective lacquer - diamond coating from sinitered material - drill has to be sharpened before first use. Our standard Quality Drills are all from Italy. Bohle also produce exceptionally high quality industrial standard drills for high volume production, and special glass, solar panel glass and ceramic substrates which are Made in Germany - please contact us directly for specialist requirements.
Drill Speeds
Ø 3-4 mm = 4000 - 5000 rpm
Ø 5-15 mm = 2000 - 3000 rpm
Ø 16-25mm = 1500 - 2000 rpm
Ø 26-50 mm = 500 - 1500 rpm
Ø 51-100 mm = 300 - 800 rpm