Abstract: A nut guide guides a nut member of a spinal implant having an implant body and an anchoring screw section, and also guides a driver tool having a lower end formed with a nut engagement tip. A a vertebral connecting rod therein is retained with a pair of the spinal implant to be anchored into vertebral bodies. The nut guide includes a grip section, and a hollow cylindrical shaft extending from the grip section and adapted to permit insertion of the driver tool therein, the cylindrical shaft having a lower distal end formed with a rod engaging segment for engaging with and retaining the connecting rod to place the lower distal end in a fixed place, and a threaded bore formed rearward of the rod engaging segment for momentarily receiving the nut member therein.