"UNIVERSAL BLADE BALANCERS - Centered and level to provide accurate balancing. The largest step on the cone is 1 3/8 inches, while the base diameter is 2.36 inches. Each pack contains 2 pieces of precision blade balancers USED FOR BALANCING LAWNMOWER BLADES AFTER SHARPENING - Ensure an even an accurate lawnmower blade sharpener with a static blade balancer. Regular blade balancing after sharpening will also allow you to identify bent blades MADE OF METAL - Each blade balancer has two parts: the base with a center pin, and a step cone COMPATIBLE WITH MOST LAWNMOWER BLADES - Designed with standard lawnmower blades in mind. These universal precision blade balancers work best on blades with circular center holes. They are compatible with most lawnmower brands and models, including Stihl, Craftsman, Troy, and more REDUCE ENGINE WEAR WITH BALANCED LAWNMOWER BLADES - Get a smoother cut in the short term and enhanced longevity for your lawnmower in the long run. Balancing lawnmower blades reduces engine vibration and wear"