Our Milwaukee 21oz Milled Face Poly/Fiberglass Hammer (48-22-9320) to have the most durable fiberglass handle for added durability on the jobsite. The 21oz milled face hammer’s reinforced fiberglass handle core provides the highest durability among fiberglass hammers. The fiberglass hammer’s precision balanced design delivers more control when swinging the hammer. The hammer’s magnetic nail set is designed to allow you to set nails one-handed and the anti-ring rip claw minimizes ringing when striking hard objects.