4 mm hex screwdriver/key is required

designed to improve the accuracy and stability of the sharpening angle adjustment on the TSPROF K03 sharpening system

there is a thread for a wrench for a strong connection to the holder

Baikalite is mined in the Baikal region of Russia

venev sculptor series narrow diamond boxed set 6 x new 4 mm hex screwdriver/key isVenev Gemini Series Boxed Set "Alfa Sculptor" includes six 6" narrow diamond stones: F80, F150, F240, F400, F800, and F1200. The set comes in an exclusive storage box. Venev Sculptor Series Diamonds are designed for expert knife sharpening in systems such as Hapstone and TSProf. Diamond sharpening stones provide excellent performance on knives made from any steel. Narrow stones (12 mm wide) are ideal for recurved blades. Sculptor Series features Metal