Hex Head Screw / AYP 173984Pack Size:1AYP 173984, AYP 138776, AYP 157722, Husqvarna 532 17 39-84, Husqvarna 532 13 87-76, Husqvarna 532 15 77-22J. Thomas 532173984, Laser 97639, NHC 251-0640, Oregon 02-304, Oregon 02-301, Rotary 9374, Stens 285-040AYP PP 44" decks, 9540052-61 quill assemblyLength: 1 1/4 " THREAD, Thread: 5/16 "-18, Self tapping mounting bolts, Package of 4, Priced per pack, sold per pack