H.18D has the same specs as the H.18, except includes a duplex spring for added flexibility. H.18 is for use with only 2.35mm (3/32″) shank burs. A press lever action is all that is required to change accessories. It features a very slim grip and pre-lubricated ball bearings that do not require any lubrication. 10-3/8″ long, 19/32″ dia., wt: 5.3 oz., ship wt. 6.85 oz.
Duplex springs are subject to breakage and are NOT covered by warranty. They are made of special steel, double wound tubular construction with a protective flexible spring cover. Replacement springs (HP76) are available and can be installed by the user. We recommend that only experienced users of flex shaft tools consider purchasing this style handpiece. For most users, the “straight” handpiece (H.18) is the preferable solution.
H.18D is a standard key tip handpiece.
H.18D Handpiece Instructions