1.Regardless of paper thickness, from 2 to 170 sheets(70g), one needle is enough, worry free of chang staple for any thickness to be bound. 2.Simpler and easier for binding. 3.Stitches automatically fixed, facilitate files piling up; 4.Leading trend, helping increase work efficiency; 5.Color: silver, milky white, black; 6.Quantity: 4 sets in Carton; 7.Net weight: 9.8(kg); 8.Gross weight: 12(kg); 9.Staple request: 23-20