Pack of six Gates Glidden drill size #4 ; 32mm
I have only one size to clean the access of the canals. If the canal has a broader opening than the drill, while on I “wipe” the drill gently around the circumference to clean the edges. Remember the size of no. 4 drill is equivalent to a size 110 file! I only use them to widen the orifice for straight line access. Note the non-cutting tip and eliptical shape of the drill. They are very aggressive drills. I do not advocate using smaller drills as the clinician will tend to use them more apically and risk strip perforations.