Hario Skerton Upgrade Kit Fits Hario Skerton and Kyocera CM-50 grinders Stabilizes lower burr to produce a more consistent coarse grind. Perfect for french press grinds! Easy installation with only a screwdriver in about 5 minutes. Fits Hario Skerton, Khawfee HG1B, and Kyocera CM-50 grinders (Not the Hario Skerton Pro) Stabilizes lower burr to produce a more consistent coarse grind. Perfect for french press grinds! Easy installation with only a screwdriver in about 5 minutes. MADE IN THE USA