Hard Hat Suspension, Head Protection Suspension Type Pinlock (4-Point), Fits Hat Size 6-1/2 to 8, For Use With Americana Full Brim hard hats, Compatible Hard Hat/Helmet Brand Name AMERICANA, Compatible Hard Hat/Helmet Grainger Part Number 41N917, 41N918, 41N919, 41N920, 41N921, 53EA52, 53EA53, 53EA54, 53EA55, 53EA79, 53EA80, 53EA81, 53EA82, 53EA83, 53EA84, 53EA85