The TFRK ultra sonic straight tip is a very thin and long ultra sonic tip which is used to trough around the top of the fractured file. This helps you to expose a certain part of the broken file. This is necessary to place the lasso around the file. It also pre-loosens or completely loosens the ingrained file. These especially thin US-tips are almost a “conditio sine qua non” for a serious attempt to remove a separated file.
