The Kempston router bit is a must-have addition to any woodworker`s tool collection. Based on our own experience we found that the bit provided precise AND clean cuts through our wood projects. The bit's diameter allows for a wide range of groove sizes, making it versatile for various applications. The bit is made from durable materials and is a great value for the price. Our only concern is that it may wear down faster when used on harder woods. Overall, a reliable choice for those in the market for an industrial and scientific router bit..