One set of two (2) replacement tines for some Howard E, HR, HX, 15-20-30-35, HB-ST180, 500S, 500B series rotocultivators which includes one (1) 63592 and one (1) 63593 tine. These tines have two 1/2" mounting holes 2-1/4"" on center, are 1/4" thick and are 3-1/8""wide. If you need more tines just increase the quantity to purchase at checkout.