Made by Aclé of Paris for over 50 years, these clips come complete with hook in levers for opening. Once in position these are removed giving a semi permanent binding. Available in 3 sizes: size 1/2, width 15 mm - for stacks up to 5 mm (approximately 50 sheets); size 5, width 35 mm - for stacks up to 20 mm (approximately 200 sheets); and size 7, width 35 mm - for stacks up to 40 mm (approximately 400 sheets).