OX Spectrum Pro Superfast Helix Dry Diamond Core Drill – 22mm-BSP. Pre-drill 13mm pilot hole. Insert guide rod into core bit. Using rotary action (no hammer). Drill hole, regularly withdrawing bit. To clear dust build-up. Can be used with dust extraction. System (ask supplier for details). If blunting occurs, core bit can be. Re-sharpened by running in a soft. Abrasive material such as mortar. Sandstone, or soft breeze block. Do not attempt to drill concrete or other. Hard products, except with designated. Core bit (ask supplier for information). If drill overheats, stop use immediately. And contact your supplier for advice. Do not drill into loose material as this. Can cause segment detachment. Minimum motor size – 850 Watts. Use correct safety wear, including. Gloves and safety goggles/glasses. When drilling, use steady pressure. Do not force the core. Ensure equipment does not overheat. Stop regularly if cooling breaks are. Check core bit frequently for damage to. If this occurs, stop use.