Lifetime : If For Any Reason You Are Not Happy With Your Purchase, We Will Refund Or Replace Your Stapler Heavy Duty Metal Stapler: Simply Staple from 10 Up To 100 Sheet (20lb Paper) Comfortable Design: High Strength Spring Lets You Easily Staple 100 Sheet With Slight Force Only compatible with HEAVY DUTY staples: this stapler has to be used with HEAVY DUTY staples otherwise it will not work properly Includes 1000 Box Of 1/2” Staples (Used For 50-100 Sheet)