One of the great things about I-joists is that you can cut monstrous holes for ductwork and other mechanicals. But using a recip saw to make those holes is slow, and there's always a risk of cutting into a flange. A better method is the Matrix Xtreme hole saw. Its billet aluminum frame holds three easily replaceable blades that, according to the manufacturer, resist binding and cut faster than the teeth on conventional hole saws. In addition, the cutters are mounted about 3/8 inch from the outside edge, which prevents the blades from getting too close to flanges. They'll work with an ordinary heavy-duty 1/2-inch drill because the small cutters require less torque than the continuous teeth on conventional, large-diameter hole saws. Sizes go from 3 5/8 ($88) to 12 1/2 inches ($167). Matrix Xtreme, 866/320-5340, www.matrixxtreme.com.

Making flush cuts with a recip saw usually requires dragging your knuckles and bending the blade — a blood-letting practice that can damage materials you want to salvage and greatly reduce a blade's lifespan. But the Flush Cut Adapter does the same thing without the knuckle dragging or broken blades. The add-on blade holder has a 1 5/8-inch...

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