Size: 14cm to 23cm Adjustable Tension Screw Finger Rest Plasma Coated Finished Made With High Quality J-2-440 C Japanese Stainless Steel. Rockwell HRC 58-60 J-2-420 Japanese Stainless Steel. Rockwell HRC 54-56. J-1-410 Pakistan Stainless Steel and Rockwell HRC 42-44 Also Available In Finishes: Plasma Blue, Plasma Gold, Plasma Gun Metal, Powder Coating, Full Gold, Half Gold & Half Black, Dull and Mirror Polish Finish, Chrome Finish. Mate Black Finish