Imbus tip length 150mm for quick and easy adjustment of BV9900, BV9900S, BV8900, BV8900S systems. The bits can be used with either a screwdriver or a hand screwdriver with a 1/4″ hex grip. The tip of the tool ends with a spherical head that can be used to tighten at an angle. For convenience in some case the tip features a magnet.