As posted they are the brand called Hi-Lift....the term nickname we call them here in Alaska is "handyman jack".
I had a welding friend make me a much wider base 8" x 8" to replace the puny useless narrow 2" x 6" factory base ones they have on all my handymans, and course surfaced on the bottom of the base for piece of mind so they can grip on hard snowpack even better, or else the whole jack will slip underneath the rig and potentially give you a deep bruise like one did with me on my lower leg with the small puny base that is totally smooth from the factory.
The wider base is even more efficient on soft permafrost areas, tundra or mud-muskeg type terrain as the jack sinks less as the typical spring thaw gotta get unstuck scenario occurs every April-May around here on trails and remote driveways.