Spindle Pulley / AYP 153535Pack Size:1AYP 129861, AYP 153535, AYP 173436, Husqvarna 532 12 98-61, Husqvarna 532 17 34-36Edgewater 506105, Laser 95139, NHC 276-0684, Oregon 44-370, Prime Line 7-05670, Rotary 7180, Sunbelt SB-7180, Sunbelt B1SB7180AYP 42" and 48" decksID: .640 " DOUBLE HEX, OD: 5 1/8 ", Double hex ID, One-piece steel — no rivets for stronger bearing