Compatible with the Milwaukee Reciprocating saws and other similar models. Adapter keeps your foam blade safely in place. The foam saw blade adapter is made to hold foam-cutting (open cell or closed cell) blades properly and keep them snug in place. Whether you're working on a big project or a small one, having a proper foam saw adapter is essential to safely completing your project. A faulty or worn-out adapter can cause the blade to come loose and potentially harm your project or the user. Be sure to check screws for tightness over use. * Not compatible with cordless models * Fits Recip Saw with Standard 5/8 Chuck