Each Pro Bee Block has approximately 60 holes providing space for about 360 Mason Bees giving you an estimated 120 females.
Pro bee blocks included as pictured.
The center divider gives you the versatility of 2 Pro Blocks. You can alternate blocks year after year. Let the Mason bees nest in one block the first year. Set out the second block in the second year for the first year bees to move into. When the bees have left the first year block take it down, clean and sanitize it and now you have your third year block and so on.