A YATO 25-piece HSS-CO drill bit set is a collection of 25 cobalt metal drill bits designed for precise drilling in difficult materials such as stainless steel, non-ferrous metals, plastics, and acid-resistant steel. These drill bits are known for their high temperature resistance and are suitable for industrial use [2].

According to www.iAsk.Ai - Ask AI: The YATO HSS-CO drill bit set typically includes 25 drills with diameters ranging from 1 mm to 13 mm, often in 0.5 mm increments [2] [4]. The "HSS-CO" designation indicates that the bits are made from High-Speed Steel (HSS) with a cobalt alloy, usually 5% cobalt content, which significantly enhances their heat resistance and durability, making them ideal for drilling through tough materials like hardened metal and stainless steel [1] [4] [8]. These sets are often fully ground (HSS-G) for high accuracy and extended tool life, adhering to standards like DIN 338, and may feature a 118° point angle [4]. While the specific YATO set mentioned is a prominent example, other brands like Makita and unbranded options also offer similar 25-piece cobalt drill bit sets with comparable specifications for metalworking applications [3] [1]. Such sets are commonly found on e-commerce platforms and in industrial supply stores [1] [2] [3] [4] [6].