A system for inserting a vertebral anchor (300, 400) into a vertebral body, the system comprising: an intervertebral spacer (10, 90) having at least one bore (26, 93) with a generally circular cross-section; at least one vertebral anchor (300, 400) capable of being received in the at least one bore (26, 93); an insertion device configured for positioning the vertebral anchor (300, 400) through a plate portion of the intervertebral spacer (10, 90), characterized in that the insertion device comprises: a trailing housing defining one or more elongate channels; an anchor housing defining one or more anchor channels, a first anchor channel of the one or more anchor channels being configured to guide the vertebral anchor (300, 400) out of a distal end of the anchor housing along a first trajectory; and a guide member configured to extend through a first elongate channel of the one or more elongate channels and the first anchor channel, the guide member configured to move along a first longitudinal axis when disposed within the first elongate channel and the first anchor channel and abut the vertebral anchor (300, 400) disposed within the first anchor channel, wherein the first longitudinal axis and the first trajectory intersect one another, characterized in that the anchor housing includes one or more features to engage with corresponding features disposed on a plate portion of an intervertebral spacer, the features comprising a threaded shank extending longitudinally outward from a leading face of the anchor housing configured to be received in a threaded bore of the plate portion of the intervertebral spacer and an extension extending longitudinally outward from the leading face of the anchor housing to be received in a channel of the plate portion of the intervertebral spacer. an intervertebral spacer (10, 90) having at least one bore (26, 93) with a generally circular cross-section; at least one vertebral anchor (300, 400) capable of being received in the at least one bore (26, 93); an insertion device configured for positioning the vertebral anchor (300, 400) through a plate portion of the intervertebral spacer (10, 90), characterized in that the insertion device comprises: a trailing housing defining one or more elongate channels; an anchor housing defining one or more anchor channels, a first anchor channel of the one or more anchor channels being configured to guide the vertebral anchor (300, 400) out of a distal end of the anchor housing along a first trajectory; and a guide member configured to extend through a first elongate channel of the one or more elongate channels and the first anchor channel, the guide member configured to move along a first longitudinal axis when disposed within the first elongate channel and the first anchor channel and abut the vertebral anchor (300, 400) disposed within the first anchor channel, wherein the first longitudinal axis and the first trajectory intersect one another, characterized in that the anchor housing includes one or more features to engage with corresponding features disposed on a plate portion of an intervertebral spacer, the features comprising a threaded shank extending longitudinally outward from a leading face of the anchor housing configured to be received in a threaded bore of the plate portion of the intervertebral spacer and an extension extending longitudinally outward from the leading face of the anchor housing to be received in a channel of the plate portion of the intervertebral spacer. a trailing housing defining one or more elongate channels; an anchor housing defining one or more anchor channels, a first anchor channel of the one or more anchor channels being configured to guide the vertebral anchor (300, 400) out of a distal end of the anchor housing along a first trajectory; and a guide member configured to extend through a first elongate channel of the one or more elongate channels and the first anchor channel, the guide member configured to move along a first longitudinal axis when disposed within the first elongate channel and the first anchor channel and abut the vertebral anchor (300, 400) disposed within the first anchor channel, wherein the first longitudinal axis and the first trajectory intersect one another, characterized in that the anchor housing includes one or more features to engage with corresponding features disposed on a plate portion of an intervertebral spacer, the features comprising a threaded shank extending longitudinally outward from a leading face of the anchor housing configured to be received in a threaded bore of the plate portion of the intervertebral spacer and an extension extending longitudinally outward from the leading face of the anchor housing to be received in a channel of the plate portion of the intervertebral spacer.