High Efficiency

 - GUNDRILL drillis at high speed in diameter from 2mm to~65mm in depth up to 100 x's dia.and greater.
 - BTA DRILL drills at high speed in diameter from 16mm to~105mm in depth up to 100 x's dia.

 precision

 - High penetration rates Example : under 1mm per 1000mm depth
 - Exellent finish
 Supplying a large amount of coolant oil and Gundrill pad makes bunishing effect. 
 It is better than Twist Drill. 
 - High tolarence, precesion roundness

 Drilling high hardness

 - It is able to drill HRC 40~ 50 because of Carbide tip.