Silvolite Dualoy Diesel Pistons with Rings – Set of 8. STD – Standard Bore Size. Set of 8 Pistons and Rings. Dualoy Diesel pistons are cast and machined in-house to maintain the highest level of quality and consistency. Available for most popular diesel light and medium-duty truck applications, and engine codes. All Dualoy pistons feature a high strength top ring carrier to improve strength of the top land, and resistance to the extreme heat of diesel engines. Oil cooling galleries are cast into the pistons, as required depending on the specific application. Picture is of General Item, May not be actual Item.