Simpson Swan Secure S13A250IPBP 2-1/2-Inch by 0.095 Ring Shank Insert Plastic Collation T-304 Stainless Steel Coil Siding Nails, 600 per pack 304 Stainless Steel 15-Degree plastic sheet insert collation ring shank Coil Siding nails 2-1/2-Inch by 0.095 ring shank plastic sheet insert stainless steel Coil Siding nails 600 Per Box Fits all standard 15-Degree plastic collation Coil Siding nailers See www.swansecure.com for more technical information