Package and Size: Our bookbinding kit contains 11 piece T-shaped bookbinding spacer in 11 different size. Long ruler size: 200mm/7.87inch of length; 20mm/0.78inch of wide; 2.5mm in thichk. There are 11 size of short corner cutter: 3/4/5/6/7/8/9/10/20/30mm, which can meet the needs of daily use.Quality Material: Our book binding tools are made of high quality acrylic material, durable and not easy to break, our bookbinding tool features a transparent design, making it more convenient for you to complete DIY tasks.Versatility Use: These tools can accommodate books of various different shapes and sizes. From pocket-sized novels to bulky textbooks, our alignment tools are the one-size-fits-all solution you have been looking for. It is a durable companion for collectors, students, and professionalsMinimize Waste: By ensuring that you cut just the right amount of cover material, our alignment tool helps minimize waste. Protect your books and the environment simultaneously, promoting a more sustainable wrapping habit.Wide Application: Printed paper, ribbon, cardboard, washi tape, stamps and various decorations are used and decorated with the help of it. It can be made on albums, notebooks, letters, cards, postcards, agendas and planners.