Groove Grinding Solutions by Herkules. ... Specificationpiston Ring Groove Grinding grinding machine 7130g f specificationpiston ring groove grinding; grinding mills and hulliers; machinery for sale, 21 0 60 2 9 3 9 3 45 5 Cal 5130 , 21 0 60 2 9 3 9 3 45 5 Cal 5130 21 0 60 ...