Tempered for spring action Zinc plated Made of high quality carbon steel Very sturdy Includes: (10) 1/4", (5) 5/16 •Pins for power take-off (PTO) assemblies. Use for a wide variety of farm, lawn, garden and industrial applications.•Tempered for spring action•Zinc plated•Made of high quality carbon steel•Very sturdy•Includes: (10) 1/4", (5) 5/16", (5) 3/8" 20 Piece PTO Pin Assortment