Phil Wood mountain bike hubs are offered in both disc (ISO) and non-disc. Standard spoke hole counts are 28, 32, and 36 (other spoke hole count options are availabe upon inquiry). All mountain hubs are offered as quick-release, though it can be converted to a bolt-on hub for an upgrade. Rear hubs are available in 130 and 135mm spacings.
An example of a rear cassette mountain hub.
Mountain front disc hub.