X-Acto - No. 8R Utility Knife - Carded - X-Acto 8R Utility Knife offers superior cutting. The fully retractable blade adjusts to different cutting depths to suit any job. Blade cuts packages, rope, canvas, wood, plastic, carpet, and wallpaper. Available with a metal or plastic handle. Heavy Duty Utility blade replacements available. Xacto Number 8 Blades are two sided, when one end of the blade dulls, reverse the blade for twice the cutting life!