NOS original Dellorto screws with the slots and washers for UB 20/22/24mm and UA/MA 13-19mm Carbs with top feed float bowl. These are original Dellorto parts sold in a set of 2 screws and 2 washers. NOTE: There are several different float bowls with different hardware. Please check your carb before ordering. Dellorto part number 1419.