Mastel SafetySpear Keratome Diamond KnifeNewMed® Mastel SafetySpear keratome diamond knife is a precision surgical instrument designed for ophthalmic procedures. Angled with a 2.60 mm, 2.80 mm, 3.0 mm, or 3.20 mm wide blade, this knife features a tip angle of 90º, safety beveled sides, and a sharp t..