I bought a plate set that was said to be for a 6" Rotary Table, but I haven't found a reference to the PYH brand. I expect that it is an import generic/house brand like SPI is for Enco.
I thought there might be a possibility that these would fit a 6" Phase II RT, but they don't.
So here are the dimensions and hole pattern numbers for a RCM archive reference:3 plates marked A - B - C
Diameter: ~4" 100mm
Center Hole Size: 0.827" 21mm
Attachment holes: 3 hole circle ~1.263" ~32mm Center-Center 1.09" 27.67mm
(A) 15, 16, 17, 18, 19, 20
(B) 21, 23, 27, 29, 31, 33
(C) 37, 39, 41, 43, 47, 49
The arm for the indexing pin appears to fit a handwheel shaft with two flats, not a keyed shaft like the Phase II has. The mounting slot appears to fit across ~3/8" or 10mm handwheel shaft flats.
The set looks the same as the Enco/MSC 6" SPI import brand plate set.
PYH TDM1F/6 6" Rotary Table Dividing Plate Set Made in Taiwan
TDM1F/6 Cat # 51-225-1 Model # 05082466
Stock/SKU label number 87405082466 070 (looks like an Enco or maybe MSC label)