SHELF MAGIC HIDDEN CONCEALED SHELF SUPPORT WHITE NYLON K-91309W

K-91309W..Concealed Shelf Support For users with 32mm hole boring machines, 5mm diameter holes are drilled into the sidewall. The special headed screw is inserted into the hole. In the bottom of shelf a 20mm hole is drilled 9/16″ deep with the center 9mm from the edge of the wood. After the nylon disk is inserted into the shelf a downward pressure locks it onto the screw head. Tough Nylon white with steel screw. All machining operations are into the face of the wood, not into the end grain. Sold by each.