... . 2. W/O.L.:100 - 460mm. 3. Application: hard, middle, soft concrete. 4. For deep hole. Specification of diamond concrete core ... .2. W/O.L.:100 - 460mm.3. Application: hard, middle, soft concrete.4. Good Shapeness. 5. Thread: M14, 5/8-11 ... drilling.4. Fast speed for drilling.concrete tool - core bit:Diamond core bit for soft concrete. Can provide excellent drilling performance on ...