Unique Design Allows for Adjustable Blade Exposure!Unlike other retractable safety knives, the Slim Adjustable Auto Retractable Cutter allows you to cut with precision every time with adjustable blade exposure down to every 0.1mm. Blade length adjustable from 0 to 40mm. The auto-retractable blade is safely hidden when not in use user must hold slider button while cutting.Only 5mm thick, suitable for precision work. Replacement blades available separately #89454.