Foredom's H.20D is for exclusive use with 3/32" (2.35mm) shank burs. A lever action on the handpiece body is all that is required to change accessories. It features a molded plastic front grip with tapered sides for easy and close handling, plus pre-lubricated ball bearings that do not require additional lubrication.

The collet in this handpiece cab be replaced and/or adjusted if the hold on a bur shank is not secure. The Duplex Spring should NOT be bent more than 30°.

In essence the Duplex Spring provide extra flexibility to a handpiece when more precise control for delicate work is required. The spring drive is made of special steel, double wound, tubular construction with a protective flexible spring cover.