... 4341,4241,etc;4)Treatment:Ti coating,fully ground,milled,black,etc5)Concrete Using:drilling in steel,wood,concrete,...etc6)Any ... 6.3mm;APPLICATIONS:Designed to reduce the bearing of the center hole and provide a protected centering seat while reducing the ... Included Angle Right,Drill DIAMETER ,APPLICATIONS:Designed to maintain accurate center holes on long production runs ,or when precise centering is ...