Castroviejo Needle Holders are a surgical instrument used for microsurgery requiring precise control and manipulation of small needles, though they are most commonly used in ophthalmic surgery. Our Castroviejo Needle Holders feature fine tips for grasping and manipulation of small, delicate needles. The jaws can either be serrated (cross-hatched) or smooth. Serrated jaws help prevent slippage and ensures a secure grip on the needle, though this may not always be required. With fragile tissues, a serrated tip may cause excessive trauma or damage to the tissue, and a smooth tip may be preferred. Some synthetic sutures, such as polypropylene or PTFE, are less prone to slipping than natural sutures and may not require a serrated tip. If a surgeon is approximating a delicate tissue layer, a smooth tip may be chosen. The locking mechanism on the spring handles ensures the needle is held firmly and reduces the risk of slipping.