Delta 22-540 guage  for  the Delta 12" portable planers (22-540) type 1 & 2, and the TP300.   This is a true accurate gauge, not a close to spec gauge.   This will work on the 48mm diameter heads. THIS GAGE WILL NOT WORK ON ANY FULL SIZE PLANERS, 15" PLANERS, 13" PLANERS, 16" PLANERS, OR 20" PLANERS. YOU DO NOT NEED THIS GAUGE IF YOU HAVE THE 22-555, 22-560, 22-580 OR 22-590 PLANERS.  THESE ALL USE INDEXABLE KNIVES.  Shipping on this item is free via USPS or UPS. I do combine shipping wherever possible. I do ship internationally. Just email me and I will quote shipping to your country.  Please note the countries that I do not ship to.