Marking Drill For (SD-TOP refill)The marking drill is a special tool, intended for initial bone cut inside a molar socket. This drill is used to set a cutting path for the following trephine drill, to extract the bone material. This drill is made from high quality stainless steel. The cutting part is hollow and coated with a diamond coating on the upper part for smother performance and easier cutting through the bone. This marking drill is intended to be used as an initial drill