Gripping head configured for gripping a block of material (B) comprising a pair of jaws wherein each jaw of the pair of jaws extends at least along a longitudinal direction (L) and comprises a gripping portion configured for gripping said block of material (B), and wherein at least one of the jaws of the pair of jaws comprises: - a plurality of first shaped elements placed one beside another, or arranged side by side, to form a first row of first shaped elements along said longitudinal direction (L) and a plurality of first variable empty spaces each interposed between two first shaped elements ; - a plurality of second shaped elements configured for modifying the gripping portion , wherein said second shaped elements are placed one beside another, or arranged side by side, to form a second row of second shaped elements along said longitudinal direction (L) and a plurality of second variable empty spaces each interposed between two second shaped elements ; wherein said first shaped elements have a profile complementary to the profile of said second shaped elements ; and wherein said first row of first shaped elements and said second row of second shaped elements are staggered with respect to one another and one or each of the second shaped elements is at least partially housed in a respective variable empty space of the first variable empty spaces and one or each of said first shaped elements is at least partially housed in a respective variable empty space of the second variable empty spaces ; and wherein said second shaped elements are movable along at least one transverse direction (T), orthogonal to the longitudinal direction (L), and a translation of said second shaped elements in the transverse direction (T) is apt to determine a translation of said first shaped elements at least in the longitudinal direction (L) and an enlargement or restriction of said first variable empty spaces and a variation of the extent of the housing of said second shaped elements within said first variable empty spaces . - a plurality of first shaped elements placed one beside another, or arranged side by side, to form a first row of first shaped elements along said longitudinal direction (L) and a plurality of first variable empty spaces each interposed between two first shaped elements ; - a plurality of second shaped elements configured for modifying the gripping portion , wherein said second shaped elements are placed one beside another, or arranged side by side, to form a second row of second shaped elements along said longitudinal direction (L) and a plurality of second variable empty spaces each interposed between two second shaped elements ; wherein said first shaped elements have a profile complementary to the profile of said second shaped elements ; and wherein said first row of first shaped elements and said second row of second shaped elements are staggered with respect to one another and one or each of the second shaped elements is at least partially housed in a respective variable empty space of the first variable empty spaces and one or each of said first shaped elements is at least partially housed in a respective variable empty space of the second variable empty spaces ; and wherein said second shaped elements are movable along at least one transverse direction (T), orthogonal to the longitudinal direction (L), and a translation of said second shaped elements in the transverse direction (T) is apt to determine a translation of said first shaped elements at least in the longitudinal direction (L) and an enlargement or restriction of said first variable empty spaces and a variation of the extent of the housing of said second shaped elements within said first variable empty spaces . <EOS>