This document is the 18" Solid Locking Grate Assembly Nyloplast Detail. It shows illustrations with descriptions.

The side view illustrations show the 18” cover frame & 18” Solid cover with 5/16-18 x 1 1/8” long hex bolt zinc-plated steel in 2 places. The top down view shows the grate with drill thru position and the frame drill thru thread position.

A note states that the location of locking device may vary.