Dimensions (Item): 8 x 8 x 0.8 cm How to place: pierce the outer cover at the height of the cable cover feeder. Screw the cap on, keeping the hole you just opened as the center. From now on, you can fill the feeder by opening the cap, thus avoiding stressing the swarm and saving time and effort. Constructed of food-grade plastic. 1. Ventilation grid/feeder cap:Can be used as a ventilation grid to maintain the right temperature in the Beehive, or as a cap for syrup feeding. 2. Beehive small entrance:By turning the mechanism clockwise, the cap turns into a small entrance for bees. The small entrance makes it easier to protect the Beehive in case of attack and allows the bees to defend themselves better. Large entrance/feeding cap:By removing the mechanism, the cap can be used as a large entrance or as a feeding cap on the lid of the Beehive