Description: It is based on the fact that bees are smaller than queen bee, or drone, and for the passage of bees needed gap is smaller than the queen bee or drones. Features: Strong and durable. Essential tool for beekeeper beekeeping. The holes in the grid are perfectly designed to allow the worker bees through to the honey supers but not the queen. Easy to clean. The main purpose of the separation grid - to prevent the passage of the queen bee, or drone in a split grille part of the bee nest. Specification: Condition: 100% Brand new Material: Plastic Color: White Dimension: app. 51cm x 41cm/20.08 x 16.14inch Package weight: approx. 278g Package Includes: 1 x Queen Excluder (Queen excluder only, other accessories demo in the picture is not included!) Note: 1. Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!