CROWNMAN cutting tool has the following utility knife series: economic models, basic models, classic models, and professional models. Economic model: 9mm/18mm, multi-purpose for office/DIY/handwork, large quantity and cheap, but not durable for a long time; Basic model: These two single-shot 18mm models are economic models for industrial and mining use, fully automatic assembly line production, large quantity, economical benefits, and durable use; Classic models: These two single-shot rubber-coated 18mm/25mm, ABS injection, strong and durable, the same model in the market is PP rubber-coated; these two are metal, one aluminum alloy 18mm, feels good, The structure is good, there is no sound when shaking, the similar ones on the market have burrs on the surface and there are noises; a heavy-duty zinc alloy 18mm is double-color glue injection, double-tooth structure, stainless steel sheath, good structure, novel design, and stronger; Professional model: These two models are 18mm/25mm, ABS material, equipped with SK5 blackened blade, the rotary lock is stronger, stainless steel sheath, the material is thicker and stronger. The second type is used for professional workers, cutting thicker and harder materials;