Mechanics and DIYers, this woodruff key assortment is exactly what you need for various repair and maintenance jobs! The 80-piece set includes 8 different sizes with 10 pieces of each: 3x5x13mm, 3x6.5x16mm, 4x5x13mm, 4x6.5x16mm, 4x7.5x19mm, 5x7.5x19mm, 5x9x22mm, and 6x9x22mm. The rounded shape design is crucial - it helps relieve stress on shafts during high-speed applications, which is why these are used in so many mechanical systems. Made from quality metal that's smooth and flawless, not rough or poorly finished like some cheap imports. Perfect for automotive work, machinery repair, small engines, and various industrial applications. Having multiple sizes means you're prepared for different projects without running to the hardware store mid-repair. The 12-month product guarantee gives you peace of mind about the quality. If you work on engines, machinery, or any equipment that uses woodruff keys, having this assortment on hand will save you time and frustration. The organization by size makes it easy to find what you need quickly. Much better than buying individual keys when you need them. Your toolbox just got way more prepared for whatever mechanical challenges come your way. Essential for any serious mechanic or hobbyist!