3/4" x 1 3/4" x 6" Inside Corner Wood Base Block, also known as an intersect block.
Available in sets of 6, 20, 40 or a single sample block.
Fits all styles of up to 5/8" thick by 5 1/2" tall base boards.
Blocks can be stained, painted, or clear finished.
Made in the USA by Bonneville Manufacturing.