The Makita® Chest Strap (199237-5) fits Makita backpack products including the LXT Backpack Power Supply (PDC01, sold separately) and the 75.6 cc MM4® 4‑Stroke Engine Mist Blower (PM7650H, sold separately) to ensure the shoulder straps are securely positioned. This strap easily adjusts for optimum user comfort. It installs quickly. The strap is made of durable nylon for long life.