Disclosed is a standalone anterior cervical interbody spacer that includes a spacer body and cervical plate with a unique locking system rigidly couple the spacer body and cervical plate via two flexible locking pins. The locking system include locking features designed to engage with one or more flexible locking pins to lock the spacer body and cervical plate together. The locking features are part of the engagement arm or engagement protrusion with a locking pin engagement surface having distraction geometry and lock geometry. The distraction geometry includes an inclined or ramped portion and the lock geometry includes a pin engagement recess or pocket. The distraction geometry is such that as the spacer body and cervical plate are coupled, the inclined or ramped portion will engage and force the flexible pin to deform and slide on the surface.
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