The Series X Retro-Grate is a hinged and lockable aluminum grating panel that is easily installed beneath existing access covers regardless of the original cover manufacture. The Retro-Grate provides additional protection against fall through accidents when the cover is left in the open position. The unit is lockable with an owner supplied padlock and incorporates a spring assisted lifting handle that positions the handle near the slab level when the existing access cover is in the open position. The Retro-Grate incorporates a T-316 stainless steel hold open arm with aluminum latch and with T-316 stainless steel mounting hardware for either concrete or frame only installations.