Description:_x000D_ 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._x000D_ _x000D_ Features:_x000D_ _x000D_ Strong and durable. _x000D_ Essential tool for beekeeper beekeeping. _x000D_ The holes in the grid are perfectly designed to allow the worker bees through to the honey supers but not the queen. _x000D_ Easy to clean. _x000D_ 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. _x000D_ _x000D_ Specification:_x000D_ Condition: 99.99% Brand _x000D_ Material: Plastic_x000D_ Color: White_x000D_ Dimension: app. 51cm x 41cm/20.08 x 16.14inch_x000D_ Package weight: approx. 278g_x000D_ _x000D_ Package Includes:_x000D_ 1 x Queen Excluder (Queen excluder only, other accessories demo in the picture is not included!)_x000D_ _x000D_ Note: _x000D_ 1. Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid._x000D_ 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! 1Strong and durable 2Essential tool for beekeeper beekeeping 3The holes in the grid are perfectly designed to allow the worker bees through to the honey supers but not the queen 4Easy to clean 5The 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