Vestils VGLT-16-3F-Y Yellow Surface Mount Flexible Stake 36" X 3.25" is ideal for high traffic and high impact locations. Constructed of polycarbonate extrusion and flexible hinge which makes it virtually indestructible. Easy four (4) part assembly which is the post and hinge, base, grips and pin. Quick to install, they can be mounted to concrete, asphalt, wood and other hard surfaces using appropriate hardware (not included). Base 8"x8" bolt holes 1/4", FAA approved.