The Jasper PROFESSIONAL FINISH CIRCLE CUTTING SET is a 3-part cutting system engineered to WORK WITH ALL AWARD-WINNING JASPER CIRCLE GUIDES that assist the woodworker to make furniture grade circular cutouts, decorative discs, and tabletops with a blemish free finish. Compatible with all models of Jasper Circle Guide Circle cutting Jigs: M 200, 200 Pro, M 240, 240 Pro, 280, 280 Pro, 290, 290 Pro, 290 SE, 300, 300 Ltd Ed, 390, 390 Pro. How the system works: FIRST CUT PASS is made using a razor-sharp Japer 600 DOWN CUT professional grade ¼” solid carbide router bit. The downward compression gives precision cuts with sharp edges and deep channels. SECOND AND SUBSEQUENT CUT PASSES are made with a razor-sharp Jasper 601 UP CUT professional grade ¼” solid carbide router bit. The UP-CUT continues the smooth channels with flat bottoms and creates equally sharp edges on the underside of the cut. The Jasper M350 is used as the pivot point for table tops and other decorative circular discs and allows PERFECT CIRCULAR CUTS WITH A BLEMISH FREE FURNITURE GRADE FINISH.