6 - Recessed D Ring tie Down rings 1200# Rated Trailer ATV Snowmobile Lawn Mower (RR01-LOTOF6)

Each ring is rated to 1200# and measures 5" long, 3.5" wide, and 3/8" deep (they are larger than they look in the picture!). 

I use a 3" hole saw to cut a hole part way into the floor (3/8" down) then use a chisel or screw driver to "pop" the wood out of the hole, then drill 3- 5/16" holes through for the Carriage bolts(not included). I usually install right on a frame cross member for a strong mount.