[Well Compatible]Fits well for Milwaukee M18 18V Cordless Tools, which means you can use your old for Ridgid AEG 18V batteries to for Milwaukee 18V Power Tools. [Work for AEG/Ridgid 18V Li-ion Battery]: Our AR18MIL battery adapter only fit for AEG/Ridgid 18V hyper lithium battery, to replace for milwaukee 18V li-ion battery.(Battery not included). [AR18ML Advantage]This adapter can make listed lithium batteries use for Milwaukee M18 18V tools , and let you Enjoy the benefits of extended run-time of Li-Ion Batteries on your existing 18V tools. [Material Guarantee]Made of ABS plastic, solid design, made of material, durable and safe, convenient to carry and easy to use. [Easy to Use]: The AR18MIL battery adapter is really easy to use. Just insert the ridgid 18V battery into our AR18MIL adapter; and then pull both into the base of 18V for milwaukee power tools, then you can use the for milwaukee 18v power tools as normal. [Notice]It cannot be used to charge the battery of a power tool, and the adapter cannot be plugged into any charger. If you need to charge the power tool battery, use the original battery charger. color: Black Material: ABS Package Contents: 1 * Battery Adapter (AR18ML adapter only) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.