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Table 1 Specification of hollow drill tool and twist drill bit

From: In-situ tool wear monitoring and its effects on the performance of porcine cortical bone drilling: a comparative in-vitro investigation

Diamond coated hollow drill tool Twist drill bit
Outer diameter 4.5 Number of cutting lips 2
Inner diameter 2.9 Helix angle: 8.4°
Mesh size 80–100 Point angle 120°
Areal average abrasive/grain density 15 abrasive/mm2 Tool base material: Stainless steel
Abrasive/grain type Diamond   
Tool shank material EN-31   
Abrasive/grain coated method Electroplating