Tempered Steel Hardened Steel Stainless Steel Titanium Alloy Heat-resistant Steel Cast Iron Ductile Cast Iron Aluminum Alloy Copper Alloy Composite OthersBrazedReamersIndexableIndexableInsert TypeHead TypeSolidDrilling Drill Selection Guide Carbon Steel Series Drilling Depth (L/D) Coating Coolant Alloy Steel Ref. Page up to 35HRC Supply C0.28%or lessC0.29%SKDSKS 45HRC 46HRCor lessor more SUS Ti Inconel FC FCD Al Cu CFRP MLDH Type Internal G G S S G S S G G S J89Coat J MLDH-P Type Internal G G S S G S S G G S J89Coat MDSS Type External G G G G S G S G G S J92Coat MDUS Type External G G G S G J92Coat MDUP Type External G G G S G J92Coat SMD-MTL Type Head Coat Internal G G S S S G G J94 SMD Internal G S S G S S G G S J94 -MEL Type Head Coat SMD Internal G G S S S S S J104 -MFS Type Head Coat SMD Internal G G J108 -MB Type Head Coat WDX Type AuroraCoatCoat Coat Internal G G S G G G G J110 PDL Type AuroraCoatCoat Coat Internal G G S S G G G G S J124 PCT Type Aurora Internal G G S S G G G G S J124CoatCoatCoat SR Type Aurora Internal G G G S G G G S S J132CoatCoat AK Type Internal G G S S S S G J142Coat BAK Type Internal G GCoat J142 HMD Type External S S S S S S J148Coat J2-4