ToughSeries Retractable Utility Knife with Blade Storage. Take on a wide range of cutting applications with the DEWALT TOUGHSERIES Retractable Utility Knife. Designed with a new slider mechanism, this knife delivers 2x longer life and debris resistance. Engineered to provide durability in harsh conditions, this TOUGHSERIES knife helps limit blade tear-out with a secure blade lock that helps retain the blade while cutting. Featuring a slide-and-click blade changing system and onboard storage for up to 10 blades, the DEWALT TOUGHSERIES Retractable Utility Knife is cut out for tough jobs.