Infinitely adjustable blocking board for squares. See my youtube video on usage: https://youtube.com/shorts/-ftWOVcleco The video is demonstrating how to use the board and the MAT tool with 10" squares. The board in the video is a smaller model than what is being offered in this listing. Comes with: 1 - Blocking Board 1 - Post alignment guide 4 - 20cm (7.8") posts 5 - MAT (Multipoint Attachment Tool) Sets Notes: 1. Block any size from 1-1/2 inches (3.8cm) to 12.5 inches (31.75) on a side 2. Additional MAT Sets can be purchased on my other listing "MAT Sets for the Square Adjustable Blocking Board" 3. One MAT Set consists of 4 pieces for each side of the square