Recommend using at least 2mm regular Glide body plates or Glide Hammer body plates that are 2.5mm thick. These arms are 6mm thick.
These arms are designed to fit the regular 16x16 mount as well as the 19x19 platform that is found on the Brother Hobby Avenger 2806.5 motor along with a few others.
These arms are 6mm thick and made of high grade carbon in 0.5mm thickness layers. Thinner layers make the carbon much stronger and is much more expensive to manufacture. These arms do not have a chamfer on them.