For 5-frame nucs
Includes main block and detachable bottom tray.
Fill the bottom tray with a light layer of petroleum jelly and snap onto the bottom of the main block. Place the Varroa Block at the entrance of your hive. Doesn't matter if it sticking out or recessed into the hive entrance. Works just the same. Optionally, you can also mount the Varroa Block to your hive using the two holes on the either end of thebottom tray.
Dimensions: 187 x 28 x 19mm