This commercial grade surface mount umbrella base accommodates 1 1/2″ diameter umbrella poles and features a locking plate and latch that will not damage your umbrella pole. The detachable 18" high top can be removed and the low profile 5″ diameter plate is rounded on the corners and low to the ground to prevent tripping. This base can be used on concrete or a wooden deck. The Camlock umbrella base is a great semi-permanent solution for preventing vandalism to your umbrella.