Premium single-edged auger bit with specially ground tip and very dimensionally stable spirals. Premium coating to ensure minimal friction. For drilling in all soft woods on joinery machines. Due to the spiral's especially sturdy geometry it is also possible to drill exactly into thick joists. Due to the negative tolerance of the drill-Ø a tight fit is guaranteed. Due to the head's special geometry it is especially applicable for drilling in planed or finished glued laminated timber. Entry and exit of the drill bit are considerably cleaner than with a usual auger bit. Alloyed tool steel. 2800 - 3600 rpm e.g. Ø 18 mm 2800 rpm in glulam (glue laminated timber, on joinery machines)