/lib/udev/rules.d/60-uhd-host.rules is in uhd-host 3.7.3-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 | # USRP1
SUBSYSTEMS=="usb", ATTRS{idVendor}=="fffe", ATTRS{idProduct}=="0002", GROUP:="usrp", MODE:="0660"
# USRP-B1XX series
SUBSYSTEMS=="usb", ATTRS{idVendor}=="2500", ATTRS{idProduct}=="0001", GROUP:="usrp", MODE:="0660"
SUBSYSTEMS=="usb", ATTRS{idVendor}=="2500", ATTRS{idProduct}=="0002", GROUP:="usrp", MODE:="0660"
# USRP-B2XX
SUBSYSTEMS=="usb", ATTRS{idVendor}=="2500", ATTRS{idProduct}=="0020", GROUP:="usrp", MODE:="0666"
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