Harness needles size 4 are used for saddle stitching leather with an awl to pierce the holes. These needles blunt points prevent piercing the thread as it goes through the hole. #1 is
heaviest and best for holsters, saddles, etc., while #6 is best for fine work like lightweight bindings. For general, #3 is a good size.
Size #4, 20 Gauge, 2", Package 5
See related items below for other sizes.