Every Carbide Rotary Bur(https://www.carbidebursfactory.com/product/carbide-rotary-burs-metric/) is designed with a recommended speed range based on its head size and flute geometry. As a general rule, smaller-diameter burs can safely operate at higher RPMs, while larger heads must be run slower to prevent centrifugal stress. For example, a bur with a 3mm head may be rated up to 60,000 RPM, while a 12mm head may be limited to just 15,000 RPM. Exceeding these limits puts the tool at risk of developing cracks due to vibration or centrifugal force. Always consult the manufacturer’s speed chart and match it with your power tool’s speed output before use.