This ST fiber optic  connector is used for 900um jacket. It is an epoxy style connector used in conjunction with a fiber optic polishing machine and curing oven. 
|                                                                     Physical Characteristics | 
|                                                                    Material   | 
                                                                  Nickel | 
|                                                                    Compatibility | 
                                                                   900um jacket | 
|                                                                    Fiber Type | 
                                                                   Singlemode | 
|                                                                     Connector | 
|                                                                    Connector | 
                                                                   ST | 
|                                                                      Package Information | 
|                                                                    Package Quantity | 
                                                                   50 Connectors | 
|                                                                    Product Weight | 
                                                                   1 lbs [0.45kg] |