Hard Hat Suspension, Head Protection Suspension Type Pinlock (4-Point), Fits Hat Size 6-1/2 to 8, For Use With Americana hard hats, Compatible Hard Hat/Helmet Brand Name AMERICANA, Compatible Hard Hat/Helmet Grainger Part Number 41N911, 41N912, 41N913, 41N914, 41N915, 53EA44, 53EA45, 53EA46, 53EA47, Compatible Hard Hat/Helmet Manufacturer Part Number 19375, 19760, 19761, 19762, 19763, 19764, 19765, 19766, 19767, 19768, 19769, 19771, 19774