Fibre keystone couplers with their standardised dimensions can be used for easy snap-in mounting in a keystone patch panel, faceplate or surface-mount box. Consists of couplers for the six of the most popular fibre connectors

LC to LC multi mode simplex 
Approx. 27.5x21x17mm
Designed to fit industry standard keystone outlets and patch panels
Connections: female to female
Keystone housing: ABS UL94V-0