Made from engineering-grade resin, this block won't mar or damage your favorite guns and the outside rubber liner keeps the block from sliding on any surface when driving pins. And inside the block is a magnet that grabs dropped pins. So intelligently designed, you'll feel smarter just using it. FeaturesEmbedded Magnet Universal Hole Sizes Non-slip Outer Ring Central Barrel Grove 1911 Government Model Bushing Wrench Engineering Grade Resin