Fibre-Metal Noryl F500 Headgear with a 7" crown ratchet headband offers an extra margin of protection when severe working conditions require it. Headgear features a Speedymounting loop that offers on/off welding helmet or faceshield mounting on protective caps. This headgear resists heat and features a slot/pin mechanism with locking cams. The channel grip system mounts windows and grips them in place in a deep recessed channel to secure from dirt and debris. The free floating headgear can be attached to cap series hard hats.