X-Acto - Snap Off Blade Utility Knife - Ratchet Locking - X-Acto Ratchet Locking Snap Off Utility Knives allow Heavy duty cutting of almost any material. High quality carbon steel blades & a stainless steel channel for durability. Xacto Snap Off Knifes Ratchet wheel loosens and locks blade in place for security and safety. Xacto Snap Off Blade Utility Knives have a storage compartment that stores 2 additional blades (included).