Drilling teeth shape Dimension Usable Length(mm) SuggestedR.P.M
Plane Bits 6.0-6.5 40 4500
Plane Bits 8.0-9.0 40 4300
Plane Bits 10 40 4100
Plane Bits 12-16 40 3500-4000
Segment Bits 18 40-100 3500-4000
Segment Bits 19-32 40-100 3000-3500
Segment Bits 35-50 40-100 2500-2500
Segment Bits 51-100 40-100 1500-2500
Segment Bits 100-150 40-100 1500
Crown Bits 10-20 47 3500-4300
Crown Bits 25-35 47-100 3000-3500
Crown Bits 35-50 47-100 2500-2800
Crown Bits 50-60 47-100 2000-2500