GoFriend&reg; Adjustable Portable Steel Ipad Document Book Stand Frame Reading Desk Holder Office Accessories - Black The metal plate and plastic base of the book holder (Pressure clamp without elasticity) Size: (Lx W) 11.2'' x 7.3'' / 28.5 x 18.5 cm; width of the base 2.5'' / 6.5 cm (Please carefully check the size and then purchase the bookstand ) 7 grooves offer 7 different viewing angles when you reading a book. You can adjust the book stand angle according to your nedds. Our book holder provides you with ergonomic reading angle, Promotes proper posture for better spinal health Easy to use, portable and endurable, perfect for reading books at home and in office, also suit for iPad, cookbooks,sheet music, document and any other books ect.