This entrance reducer can be adjusted to fit -one size fits all—8 & 10 frame hives 3/8'' & ¾'' entrance • Easy to switch from 3/8'' to ¾'' with our telescoping metal slider • Eight 3/8'' entrance holes • Made with durable 24 gauge baked-on white metal • Screw holes provided if you want to fasten to hive • Hive not included • Mouse-proof