Hard Hat Suspension, Head Protection Suspension Type Pinlock (6-Point), Fits Hat Size 6-1/2 to 8, For Use With Omega II Cap and Full Brim hard hats, Compatible Hard Hat/Helmet Brand Name OMEGA II, Compatible Hard Hat/Helmet Grainger Part Number 3JPH5, 41N902, 41N903, 41N904, 41N905, 41N907, 41N908, 41N909, 41N910, 53EA25, 53EA26, 53EA27, 53EA28, 53EA29, 53EA30, 53EA31, 53EA32, 53EA33, 53EA36, 53EA37, 53EA38