The CR18L is one of the only 30,000-revolutions-per-minute lithium-ion cordless spiral saws on the market. Weighing 2.8 pounds, the 18-volt tool has a slim profile, a 20 percent higher power-to-weight ratio than similar tools, and a non-marring depth guide. It will cut a variety of materials. Cost: $199. ROTOZIP. 877-768-6947. www.rotozip.com.