This is the X-Acto X3000 Knife with Blade and Cap.
FEATURES: Back of knife unscrews to store up to five #11 blades Cuts paper, plastic, balsa, thin metal, cloth, film and acetate Black in color with textured rubber grip Anti-roll handle prevents knife from falling off of desk or table
INCLUDES: X-Acto X3000 Knife with Blade and Cap Three #11 Blades
SPECS: Length: 5.9" (150mm) including blade
BOX DIMENSIONS: 1.88" W. X .63" H. X 8.63" L. BOX WEIGHT: .08 LBS.