The park tool aluminum body 3 way hex wrench features a forged two piece anodized ergonomically designed aluminum body and replaceable hex wrenches 4mm 5mm and 6mm wrenches are made from industrial strength heat treated steel for long life park tool aluminum body 3 way hex wrench features 4mm 5mm and 6mm hex set wrenches made from industrial tool steel through hardened and tempered for long life chamfered tips for a perfect fit