Our #6 Knife is compatible with an assortment of X-ACTO blade numbers: • #2 - X202 • #15 - X215 • #18 - X218 • #19 - X219 • #22 - X222 • #23 - X223 • #24 - X224 • #25 - X225 • #26 - X226 • #28 - X228