Riv-Nail Rivet - #1 Stainless, 250 Count Box Double-Single Strand What does the P8M in

What does the P8M in 1000-P8M-50 mean

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Riv-Nail Rivet - #1 Stainless, 250 Count Box Double-Single Strand What does the P8M inRiv Nail Size 1 Rivets are 18 8 stainless steel rivets for belts 3 16 to 1 4 inch. What is in the package: 250 rivet assemblies in a box Each assembly: 1 semi tubular rivet pre paired with 1 pilot nail Pilot nail guides the rivet through the belt and shears off as the rivet sets Each rivet is an assembly of a semi tubular rivet and a pilot nail. The pilot nail guides the rivet through the belt into the anvil setting tool, then shears off as the rivet