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[ILLUSTRATION OMITTED]Size matters. It''s easy to see why an SDS-max rotary hammer (the red Milwaukee) is the best tool for big holes and frequent use. The ample size reduces vibration, and stout motors can turn 2-inch spiral bits. The blue cordless Makita SDS-plus rotary hammer (bottom) is handy, but its smaller chuck and motor are meant only for bits up to 3/4 inch. The 1/2-inch DeWalt hammer drill (right) is versatile, but drilling in hard concrete is slow and the conventional chuck isn''t made for heavy pounding.

The nominal size of a rotary hammer, on the other hand, refers not to the capacity of the chuck, but to the largest hole that the manufacturer recommends drilling with it. There are three classes of rotary hammers on the market, each of which uses a different--and noninterchangeable--chuck design.SDS-plus rotary hammers are designed for drilling holes from 5/32 inch to 3/4 inch. Because most masonry drilling falls into that size range, this is the most popular class of tool. SDS-plus rotary hammers are also available in cordless versions.

If you''re moving the auger more than a few feet to the next hole, shut off the engine and restart it again with the auger resting in the next pilot hole. When you''re not using the auger, just shut it off and leave it in one of the holes, or rest it on the ground with the spark plug facing up to prevent fouling, or sideways if fuel leaks from the gas cap.For deeper holes requiring the extension rod (Photos 5 and 6), dig all the holes first with the unextended auger. Never start holes with the extension rod in place. It''s much harder to hoist a 4-ft. long auger filled with earth. After the holes are dug to 36 in., attach the extension rod and dig the remaining depths all at once. At times, I''ve found it easier to simply dig the remaining few inches by hand rather than use the extension rod, especially if fatigue is setting in. Above all, clear the hole frequently. It can be a gut-busting experience to lift an auger overfilled with earth free of the hole, or worse, free a stuck auger.