Heavy Duty; Inch and Metric Scales; X-ACTO Hardened steel blade. Safety lock secures blade when not in use sold as 1 each; Heavy-duty wood base paper trimmer with self-sharpening steel blade, trigger-lock safety latch, safety guard, rulers and both English. Built to stand up to the frequent use of busy office and school environments; X-acto hardened steel blade stays sharp with the Perpetual Edge Self-Sharpening System. Trigger-lock safety latch secures blade when not in use; Safety guard keeps fingers away from the blade. Heavy-duty wood base paper trimmer with self-sharpening steel blade, trigger-lock safety latch, safety guard, rulers and both English Built to stand up to the frequent use of busy office and school environments. X-acto hardened steel blade stays sharp with the Perpetual Edge Self-Sharpening System. Trigger-lock safety latch secures blade when not in use. Safety guard keeps fingers away from the blade.