Grobet Swiss Pattern File Escapement 5-1/2" Round Cut 4 Also known as square handled needle files, these precision files are available in most of the needle file shapes. Length of cut is 1-9/16" to 2-9/16" (39.7 to 65.1 mm) depending upon shape. Swiss Pattern files means a type of fine file used for precision filing of jewelry, instrument parts, and dies. It does not necessarily mean that all Swiss Pattern files are Swiss made. Used by Professionals