Indexable carbide center drills. Pilot diameter Ø1mm ~ Ø10mm (0.039" ~ 0.394"). DIN 332 A, A+B, R forms and ANSI 60°. • The "i-Center" is a trademark of Nine9, the developer of the first indexable center drill in the world.(Patented) • Excellent repeatability! 0.02mm (0.0008") in radial direction, 0.05mm (0.002") axial positional accuracy. • High pressure coolant can be supplied through center directly to tip of center drill insert. • 4 forms are available. DIN 332 form R, DIN 332 form A+B , DIN 332 form A and ANSI 60°. • No need tool length re-setting while tool changeovers, no-sharpening, save lot time! >> More information of indexable center drill apply for ER clamping structure, ex: BT30, driven tools, tapping and turning center.