These corners are the 3 leg version -usually found on the rear corners of a cabinet where 3 sides come flush together. They measure 1.6" x 1.6" and have an internal radius of 1/2".
We also have these in the 2 leg with the front lip, 2 leg without the lip version, and also in black.
These are sold in four piece sets- most cabinets will require two sets, but note that many cabinets require different style corners on the front and rear.
(Click the thumbnail pictures above to see an enlarged view).