The Ziegler Knife Needle is 2, with a 6mm blade, and is versatile enough for making more significant, precise cuts in ophthalmic surgery. Its laterally curved blade results in smooth cutting action. Ergonomically designed square-shaped handles make optimal use of the instrument without resulting in hand fatigue. Being premium stainless steel in construction, this durable, reusable instrument stays sharp and sterile by its reuse.