The product is a lot of three GS Tooling CAT 40 3/4 - 3" HS Endmill Holders with Pull Studs. Made in the United States, these end mill holders are designed for CNC machining and metalworking applications. Featuring a CAT40 taper size, these high-quality adapters are ideal for securely holding end mills in place for precise and efficient cutting. With a California Prop 65 Warning indicating they may contain chemicals known to the state of California to cause cancer or birth defects, these tools are a reliable and safe choice for various industrial uses.