A set of 42 aerator closed spoon 1/2" tines. Replaces part numbers 522361, 7190, 100032, 121-4894, 126-026, 121-4894, T7112, 87305, JT-370, NHC 284-5093, 89-001, 522361, 373-017, and 12714. Fits models: 424, 530A and 742; 30" Stand-On Aerator; Lawnaire IV; 30" Stand-On Aerator. Length: 7 5/8 ", 3/4" hole size, .900" mounting diameter.