Trephine drills in Long and Short Versions, by Professor Pierre Machtou.
Thomas Trephines are manufactured from the highest quality Stainless Steel with sharpened blades to
increase the cutting efficiency for better non traumatic treatment. Evacuation of debris is facilitated by the openings.
Depth marks make it possible to easily control the drilling depth. The inner and outer diameters indicated on the shank correspond to the diameters of the trephine.
The trephine has to be used on a contra angle to reach the recommended rotation speed of 500 to 800 rpm).