A FineTouch Castroviejo Needle Holder, straight, no lock, is a surgical instrument used primarily in ophthalmology and microsurgery. It features a fine, straight tip without a locking mechanism, which makes it ideal for precise manipulation of very fine sutures during delicate procedures. The absence of a lock allows the user to maintain greater control over the needle holder, as it is operated with the thumb and forefinger, offering a lighter touch for accuracy.