This is an excellent mason bee nest kit for small-to-medium back yards. The house has generous eave and side walls to increase weather protection It houses a 48-hole mason bee nesting block with enough room to fit a cardboard box of starter mason bees above the nesting block.
You can purchase the full kit ( house, block and 20 cocoons) or just the house and block, or house only. The full kit comes with instructions on managing cocoons.