COIL-SERT™ inserts are supplied in coarse and fine threads. Type 2, Type 4 and Type 6 tooling are used for finer pitch inserts, which are larger in the free state than the coarse pitch insets. They have to be "pre-wound" to a smaller diameter for installation. Type 1, Type 3 and Type 5 tooling (threaded mandrel) is used for coarse pitch inserts.