The 5 1/2" Castroviejo GG Needle Holder with straight serrated jaws and a lock is a precision surgical instrument designed for fine and delicate procedures, such as in microsurgery or ophthalmic surgery. The straight serrated jaws provide a secure grip on the needle, ensuring control during suturing while minimizing slippage. The built-in lock mechanism adds to the instrument's reliability, holding the needle securely in place.