| 摘要 |
A hole saw in the form of an arbor having a cup member secured to one end thereof and a circular saw blade press fitted into the cup so that the blade flares outwardly in the direction of its cutting edge. The hole saw also includes a center pilot or drill member which may be a conventional drill, a piercing tool or a tapered pilot member. The teeth on the blade are ground so that the cutting edges are high around the outer periphery and low around the inner periphery of the blade. Selected teeth around less than half of the circumference of the blade are set radially inwardly a slight extent.
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