ME4000 Staples are mainly used within the flooring trade for securing hardboard, plywood, gripper rods and carpet. These are narrow crown staples so will drive nicely into your chosen material without leaving a bulky crown showing.4000 Series Staple have divergent points, which means that the staple legs will twist when driven into the wood to give a firmer hold. These 4000 Series Staples will work in the Maestri ME4000 Electric Stapler.