... -10000rpm 4.40-60s/hole for 3cm granite 5.Lifetime:80-120 holes Diamond Hole SawIntroduction:This core drill ... the drilling capabilities,making this the perfect choice for on site drilling.Feature:1, Fast and smooth ... heating4, Never tip off and amazing long life. Application:For drilling granite, marble, oncrete, ceramics, etc. Diameter ... according to your requirements. Brazed diamond hole saw for stone