The slightly textured scoring surface is 12" x 12", with a raised fence at the top (ruler markings) and on the left and right side. This aligns your paper for perfect scoring. No more crooked cards! Grooves are across the board at different intervals. Besides the normal 1/2" and 1" intervals there are grooves at 2 1/8" for gate fold cards, at 4 1/4" for normal A2 cards, and at 3.666" and 7.333" for brochure folding (divides 11" paper into equal thirds) When you place your card stock on the scoring surface, you are able to do multiple scores without moving the paper. Grid cards, accordion folds, boxes etc are scored in seconds. The score lines result in crisp, accurate folds! At the 0 to 1" mark and 11" to 12" mark there are 1/8" markings. By proper paper placement this will allow you to score 1/8 " increments such as 1 7/8" The included scoring tool snaps into place at the top of the unit. It is always at hand. It has been specially designed to fit the grooves so the card stock can not be torn while scoring. Additional scoring tools can be ordered separately. Perfect tool for straight and diagonal line embossing on cards and scrapbook pages!