A short cylindrical bone drill for contra angle with external cooling for screw implants. Used to prepare the bone bed implant.
Made of stainless steel.
Accordingly, the diameter of a drill is color coded.

401120 - pilot (first) bone drill
401128 - 2nd expanding bone drill

401132 - 3rd extending bone drill
401137 - 4th extending bone drill
401142 - 5th extending bone drill
401152 - 6th extending bone drill