High quality manual comb binding machine cb500 ideal for professional users with everyday need for binding documents allows you to bind up to 500 sheets of a4 a5 or letter format papers and can punch 25 sheets of paper at one time with a maximum binding width of 305mm easy to use and has a long lever for less punching force and a measuring device to help you select the correct spine size needed has an adjustable guide bar for correct alignment of paper and the punching depth can be changed de