PDT Cruise Line H6-7 DE Scaler is for use in the anterior, interproximal, and premolar areas of the mouth. PDT instruments are ideally weighted, featuring the most ergonomic handle with knurling to the instrument shank to provide increased comfort with less hand fatigue and pinch. PDT’s focus on ergonomics greatly reduces the development of musculoskeletal disorders. 6 1/2" long. 3/8" Diameter Resin Purple Handle.