I had to modify the file a little bit so it will print in both A4 and letter size. But I can't try printing in letter size. So please someone update me if it doesn't work in letter size My instructions wasn't that good. But skive this part and fold over to the first line. For leather around 1-1.2mm thickness it will compensate for the fold so the length will be correct. straps_A4_letter.pdf