Cap Stapling is a marriage of the Omer 80 series metal staple with a 1" Diameter Plastic CAP that feeds the two elements together. Ideal when holding down felt paper house wrap (Tyvek type) and insulation materials that need the "extra SURFACE area" of a CAP to hold things down when breezes blow. The system spreads the load so the staple crown alone is not asked to withstand the brunt of the forces lifting up against them. Italian quality is there to stand the test of time.