The Hole Problem Bug holes and honeycombing in your concrete work compromise strength and can lead to questions from inspectors — but you can eliminate these problems in just a few seconds with a vibrator. A cordless version like Makita's 4-foot BVR450 or 8-foot BVR850 is particularly useful for smaller residential and light-commercial projects. Each tool runs for up to 25 minutes on an 18-volt lithium-ion battery. With two batteries and a case, the BVR450 sells for about $500 and the BVR850 for $600. Makita, 800/462-5482.

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