4" ROUND B-VENT HIGH WIND VENT CAP, ASSEMBLES WITHOUT TOOLS WITH TWISTLOCK SYSTEM, SURELOCK B-VENT LOCKING SYSTEM PROVIDES SECURE LOCK BY PUSHING THE SURELOCK TAB IN, PULL TAB OUT TO DISASSEMBLE, DIMS: 8" H X 8" W X 8" D, WEIGHT: 1 LB, IN BULK, MADE IN USA.