Ask the Author: Heather N. Holm

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Heather N. Holm Hi Jack,

Diameter would range from an 1/8" to 3/8" for the small and medium bees. Large carpenter bees create their own cavity but if you're drilling a hole, 1/2" or 5/8" diameter. The length of the cavity should be at least 8" but preferably as long as possible. Heather

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