Product Specification: double wire binding machine HP3008 Binding form: Iron Ring ,Hard Plastic Ring The Max. Binding Thickness: 25.4mm iron ring The Max.Punching Thickness: 20 pages(80g) Max. Binding Width : Arbitrary Hole Distance: 3:1 (8.47mm)40 holes Design of Section:4.0x4.0mm Punching Form : Manual Size of Machine: 420x350x230mm Net Weight: 15kgs