The Double Post Punch punches approximately 3/4 inch from edge of paper. The holes are approximately 1 inch apart. The hole diameter is 1/16 inch. Recommended use. -Use with cardstock up to 80 lb weight.(Normal business card thickness) -Punch one card at a time. – ***********************MANUFACTURERS-REPLACEMENT POLICY: There is a 1 year replacement for punches. If replacement within 30 days contact Amazon.Otherwise contact manufacturer. Please read use/care on blister card for instructions before use. This product is “Protected by US Pat No. 8,763,503.” AND “Protected by US Patent No. RE46,627 E”.