A speed-increasing contra-angle turns the bur faster than the motor: five times faster at 1:5 and 4.2 times faster at 1:4.2. Bestdent lists four 1:5 models and two 1:4.2 models; all except 202C9 are listed with fibre-optic light.
1:5 models
202C9C and the red-ring 202C9A share one specification: 77 g, a ø 10 × 14.5 mm head, up to 200,000 rpm, ø 1.6 mm FG burs, a 4-port internal spray, push-button chuck and ceramic bearings. Bestdent also lists a brown "new design" version under 202C9A, for E-type electric motors. 202C9H is a further fibre-optic 1:5 model, and 202C9 is listed with a push-button chuck and ceramic bearings.
1:4.2 models
202C9G has a 45° head. 202C9J is a surgical version with internal and external cooling and a detachable head; it weighs 150 g and has a ø 9.6 × 13.5 mm head.
