Sub-group of the METALLINE® family dedicated to Boteco’s ball plungers: devices for positioning or locking equipment or machinery parts. Unlike the devices of the W-S family, these spring-loaded positioners are automatic and cannot be operated manually.In addition to spring plungers, in this group you will find a range of thrust grub screws with metal or plastic nose, and a small range of brass ball-ended grub screws without spring.  For detailed information on the specifications of each individual product please consult the technical sheet.