Stanley 680-10-113 Insulation Cutter Knife Transparent Shield Safely Compresses Batts Of Insulation For Cutting To Width and Protects Hand From Contact With Abrasive or Hazardous Materials While Cutting Easily Slips On and Off All Standard Size Utility Knives--No Other Tools Needed Comes Complete With Standard Utility Knife and Blade MSRP $7.99