* Heavey duty blackened square column ensures maximum rigidity and durability
* Precision rack and pinion gear system
* Two-gear rotary speed is designed on the core drill rig, through knob to adjust the speed of gear.
*Top-gear is suitable for 20-52 small diameter drill bit, bottom-gear is suitable for 52-70 diameter drill bit.
*Fitted with safety clutch, which can avoid damaging the frame when the twisting force is too high.
*Designed to become handheld without bracket, witch model No. is CD-80HD.
* CE certified