Bony drill cylindrical shape for angle handpiece with internal cooling for screw implants. Used to prepare the bone bed implant. With a special through-hole length of the drill, which is intended for internal cooling of the drill at preparing bone.
Made of stainless steel.
Accordingly, the diameter of a drill is color coded.

401820 - pilot (first) bone drill
401828 - 2th extending bone drill

401832 - 3th extending bone drill
401837 - 4th extending bone drill
401842 - 5th extending bone drill
401852 - 6th extending bone drill