Hard Hat Suspension, Head Protection Suspension Type Pinlock (4-Point), Fits Hat Size 6-1/2 to 8, For Use With Mfr. No. 486959, 486960, 486961, 486963, 814343, Compatible Hard Hat/Helmet Brand Name MSA SAFETY, Compatible Hard Hat/Helmet Grainger Part Number 3RRR5, 4LN92, 4LP01, 4MC61, 4MC62, 4MC63, 4MC64, 4MC65, 4MC66, 4MC67, MC60, Compatible Hard Hat/Helmet Manufacturer Part Number 454712, 454713, 454714, 454719, 454721, 454722, 454723, 454725, 454726, 454727, 454728