These arms are made for the CineGlide frame and act as 5" arms on the CineGlide. They are compatible with the Glide and they act as 5.5" dead cat arms on the Glide.
16x16 motor mounting holes ONLY on these specific arms. The CineGlide kit you order today has both 16x16 and 19x19
Good quality carbon and the deadcatarms are wonderfully suitable for filming because there are no propellers in the picture, even at low camera angles. I can only recommend it!