A stainless metal reducer for with a self-clamping chuck. Unigrip enables the use of FG burs in standard right-angles and handpieces. In the laboratory, Unigrip enables the use of thin, fine grit FG instruments with a standar micromotor handpiece. The Unigrip allows the quick exchange of thin burs without the necessity to open the right-angle. The instruments can be exchanged by pushing or pulling out the bur and simultaneously by turning left the spring.