This Bauer to Bosch battery adapter can make your Bauer 20V Li-Ion batteries work on the Bosch BAT Series 18V Li-ion battery cordless power tools, no need to repurchase new chargers and batteries, saving money. Made of ABS material, solid and durable. Convenient to carry and easy to use. Our Bauer battery converter can tightly lock the tool and battery together, will not loosen, will not slip off, and let you work with confidence!