RAZOR SHARP 18mm PRECISION BLADES - These blades are made from high quality Japanese tool grade steel for unparalleled sharpness and superior edge retention. The long lasting precision of these blades allows you to work longer uninterrupted. CONTAINS 10 HEAVY DUTY BLADES - Each refill pack has 10 solid steel blades. The non-segmented blades can be fully extended for cutting thicker materials. Be prepared for your next cutting task with these ultra-sharp utility knife blades. COMPATIBLE WITH 18mm KNIVES - OLFA's L-SOL-10B steel blades are compatible with any 18mm precision/utility knife. However, these blades perform best when equipped with an 18mm OLFA knife. CUTS A VARIETY OF MATERIALS - These replacement blades provide accurate and reliable performance when cutting thicker materials like insulation and foam board. Great for industrial use, contractors, construction, or other heavy duty jobs. THE OLFA STANDARD - As the original inventor of the Snap-Off Knife, OLFA has maintained a standard of cutting excellence for our quality and durability. Pairing your OLFA 18mm Utility Knife with OLFA 18mm Blades will provide optimal results.