There are 3 sizes for Single Double and Triple chainrings / There are 2 sizes for Washers with 1mm and 2 mm

High quality steel for Chainring Bolts Screws / Aluminum Alloy for Washers

5 pcs for Each Single/Double/Triple Chainring Bolts Screws Disc Crankset Nuts Chainwheel + 10 pcs Washers Fit for Road Bike Mountain Bike MTB (25 pcs)