Blocks are approximately 3 1/2" from center to end. I installed guide tabs for easier installation! purchase price is for 8 blocks. 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! The pictures are the exact blocks you'll be receiving! these have also been primed with Zinsser 123 stain blocker and painted two coats with Benjamin Moore super white semi-gloss paint!