Medical devices and apparatus more particularly described as a set containing devices and apparatus used by surgeons as instruments designed specifically for performing surgery on the lumbar section of the human spine. Each set includes individual devices, apparatus, and instruments, namely, namely, paddle retractor blade, hand held retractor, color-coded depth gauge, twist drill with handle, distraction screw, dual drill guide, distraction screwdriver, distractors, caliper, bone tamp, lateral disectomy blade, transverse retractor frame, side-loading locking retractor handle, and instrument case. All devices and apparatus are made of aluminum and the case is designed with holes in order to allow for proper sterilization of tray and included parts