The DEWALT 13-in three knife. two speed thickness planer is built to handle large cuts in wide materials with strength and minimum hassle. Its two speed gear box maximizes flexibility. allowing users to optimize cuts per inch at 96 or 179. With a fan-assisted chip ejection system that vacuums chips off the cutter head. you can be confident of a clear workspace. The three knife cutter-head simplifies knife changing. saving time. A 19-3/4-in cast aluminum base is twice as rigid as a standard 10-in base. providing the toughness you need. regardless of the job.Three knife cutter head of the thickness planer delivers 30% longer knife life and makes knife change faster and easierTwo-speed gear box of the wood planer allows users to change feed speed to optimizing cuts per inch at 96 or 179 CPIFan-assisted chip ejection vacuums chip off of the cutter head and exhausts them out of the machine