The Krobahn KB-BLSO0018 Snap Off Blades - 18mm (10 pack) are replacement utility knife blades made from high-grade carbon steel, featuring multiple pre-scored segments that can be snapped off to provide a fresh, sharp cutting edge. 
Key Features and Specifications
Material: Manufactured from high-quality carbon steel to ensure strength and durability.
Dimensions: The blades are 18mm wide, suitable for all standard 18mm snap-off knives.
Design: Each blade has a straight cutting edge with 7 snap-off segments (resulting in 8 cutting points). When a segment becomes dull, it can be easily snapped off to reveal a new sharp edge.
Thickness: The blade thickness is specified as 0.43mm.
Packaging: The pack contains 10 blades and is supplied in a durable plastic storage cartridge or dispenser for safety and convenience, which often includes an integrated blade snapper. 
Applications
These general-purpose blades are designed for a variety of medium-duty cutting tasks for trade professionals and DIY users:
Cutting cardboard and boxes.
Trimming wallpaper and plastic.
Cutting insulation, cable, and packaging.
General everyday utility cutting.