144 Pc Large Cotter Pin Assortment Keys safety retainer Pins Set Cotter Keys set Galvanized Steel Keys Resist Corrosion. Popular large sized cotter keys fit a variety of applications. Contents: 1/8" x 2" 50 pc. 5/32" x 2-1/2" 30 pc. 3/16" x 3" 20 pc. 1/4" x 3" 16 pc. 1/4" x 2" 20 pc 5/16" x 2-1/2" 8 pc.