two of a kind

Very similar individuals or things, as in Patrice and John are two of a kind—they're true hiking enthusiasts. This idiom uses kind in the sense of “a class with common characteristics,” a usage dating from about a.d. 1000.

The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.