【Upgraded Secure Metal Thread Design, Anti-Loose & Anti-Crack】Features screw‑in threaded design to fasten interchangeable hook heads onto the handle firmly. Yarniss crochet hooks stay secured during continuous yarn crafting work and will not shift or come loose. You can switch between different hook sizes quickly and conveniently. Great for long‑duration crocheting projects for crafters of all experience levels. 【Rechargeable LED Light for Night & Low-Light Crochet】 Built-in bright LED light powered by rechargeable battery, paired with included USB charging cable for convenient charging. The soft lighting clearly illuminates every stitch, mak