Hard Hat Suspension, Head Protection Suspension Type Ratchet (4-Point), Fits Hat Size 6-1/2 to 7-5/8, For Use With Skullgard(R) 460389, 460409, 475395, 475396, 475407, 475408, 482002, Compatible Hard Hat/Helmet Brand Name MSA SAFETY, Compatible Hard Hat/Helmet Manufacturer Part Number 816651