RCBS Bullet Moulds are crafted from solid cast iron blocks and machined to exacting specifications, ensuring accurate, clean and repeatable castings, cast after cast. The mould blocks are precision-ground square before machining and steel alignment pins are incorporated to guarantee perfect mating of the blocks, even after years of heavy use. Each mould features a durable 3/16 inches thick solid steel sprue plate, securely held in place with tempered steel spring washers and screws for lasting performance. These moulds are built for reliability and consistency, making them an essential tool for serious casters. Please note, mould handles are not included and must be purchased separately.