Inside blocks are approximately 6 3/4" from top to bottom, dimensions of the transition piece (top) are height 3 1/2" width 2 5/8". Outside corners are approx 3 1/2" from center to end and I've installed guide tabs for easy transitioning, purchase price is for 12 blocks. You can choose any combination of corners which are shown in listing photos! These are blems which didn't pass my standards but are still well made and sound and will transition up to 3 5/8" molding perfectly! This is a lowball price for someone looking for a bargain! these have also been primed with Zinsser 123 stain blocker and painted two coats with Benjamin Moore super white semi-gloss paint. I also have middle transitions and outside transitions that can be combined with your purchase. simply message me with needs.