Hard Hat Suspension, Head Protection Suspension Type Pinlock (4-Point), Fits Hat Size 6-1/2 to 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 Grainger Part Number 35GJ60, 35GJ70, 35GJ71, 35GJ72, 4LN78, 4LN79, 4LN91, 4MC46, 4MC52, 4MC53, 4MC55, 4MC79, 5KAW8, 5KAW9