Coral reefs are the most diverse of all marine ecosystems. They teem with life, with perhaps one quarter of all ocean species depending on reefs for food and shelter. This is a remarkable statistic when you consider that reefs cover just a tiny fraction (less than one percent) of the earthâs surface and less than two percent of the ocean bottom.
bumper - a mechanical device consisting of bars at either end of a vehicle to absorb shock and prevent serious damage. bumper guard - vertical bars attached to a bumper to prevent locking bumpers with another vehicle.
Parking Bumpers. Parking bumpers (stops) are made in 4' and 6' lengths. Holes are placed at each end of the piece so that a  rebar can be inserted for anchoring to asphalt or concrete surfaces. The center of the bottom of the piece is raised slightly to allow for water drainage.