This 2-piece professional watchmaker repair tool set is made of durable stainless steel and plastic. It features a watch opener configured to make opening certain cases easier, ideal for watchmakers. The tool set includes two watch case openers, perfect for replacing batteries. The yellow watch case opener measures approximately 8 * 4 * 2cm, and the red watch case opener measures approximately 11.5 * 1.5cm. The total weight is approximately 42g.