The Milwaukee 48-20-5255 2 Piece Masonry Core Bit is a set of two silver steel drill bits designed for commercial and air drill use. With an item diameter of 4 inches and a length of 2 inches, these bits are suitable for drilling into cement and other materials. The manufacturer offers a 1-year warranty on this German-made product, which has an item weight of 1 pound. Perfect for use in workshops and construction sites, these Milwaukee core bits are durable and reliable for various drilling tasks.