1,A pore diameter of 6 mm, 2,Masimum thicknessof 50 mm binding. 3,From binding to the hole as long as 30 seconds, using onlyone buttom to complete drilling relaxed,and made fully operational. 4,Faultsuggest lights, keep abreast of the work. 5,Pore-solid smooth, anti-aging,anti-insect-eaten appearance binding, paper injury.