Model 7518. This industrial-quality router features an electronic five-speed 15-amp (many folks call this the 3-1/4hp) motor with a range from 10,000 to 21,000 RPM. Strong enough to maintain constant speed under load and outfitted with a soft start to avoid sudden surges. The specially engineered 1/2" collet auto-releases the bit, eliminating bit "freeze-up". Another unique design puts the bottom bearing closer to work for minimum bit run-out and vibration. Auto-release collet system ends "frozen" bits. Unique design puts bottom bearing closer to work for minimum bit run-out and vibration. Precision machined aluminum motor housing & base 100% sealed ball bearings. Includes: Motor Base 1/2" Collet wrenches and Operating manual.