A tool component comprising a wear part (2;2';18;8';18′′′;18 iv;18 v;18 vi;18 vii;18 viii;18 ix;18 6;18 7;152;74; 320",322";350,352) that is covered at least in part by a connection member (10;10';22;334",336";358), the wear part (2;2';18;18';18′′′;18 iv;18 v;18 vi;18 vii;18 viii;18 ix;18 6;18 7;152;74; 320",322";350,352) having a hardness of at least 15 GPa, and the connection member (10;10';22;334",336";358) comprises a metal or alloy, the connection member having a hardness less than 15 GPa, the connection member (10;10';22;334",336";358) being in the form of a sheet or being a cylindrical part, and the connection member (10;10';22;334",336";358) providing a layer over at least part of the wear part; at least part of the connection member (10;10';22;334",336";358) having been pressed against at least part of the surface of the wear part such that a surface (12;12') of the connection member (10;10';22;334",336";358) that faces a surface of the wear part (2;2';18;18';18′′′;18 iv;18 v;18 vi;18 vii;18 viii;18 ix;18 6;18 7;152;74; 320",322";350,352) follows the profile of the said part of the surface of the wear part (2;2';18;18';18′′′;18 iv;18 v;18 vi;18 vii;18 viii;18 ix;18 6;18 7;152;74;320",322";350,3 52) against which it has been pressed, whereby the surfaces of the wear part (2;2';18;18';18′′′;18 iv;18 v;18 vi;18 vii;18 viii;18 ix;18 6;18 7;152;74; 320",322";350,352) and the connection member (10;10';22;334",336";358) are co-operatively shaped such that relative movement between the two parts is substantially prevented at least during operation of the tool component; and wherein not only the surface of the connection member (10;10';22;334",336";358) that faces the wear part (2;2';18;18';18′′′;18 iv;18 v;18 vi;18 vii;18 viii;18 ix;18 6;18 7;152;74; 320",322";350,352) follows the profile of the wear part (2;2';18;18';18′′′;18 iv;18 v;18 vi;18 vii;18 viii;18 ix;18 6;18 7;152;74; 320",322";350,352) but also the opposed surface of the connection member (10;10';22;334",336";358); characterized in that the ratio of the thickness of the connection member (10;10';22;334",336";358) to the thickness of the wear part (2;2';18;18';18′′′;18 iv;18 v;18 vi;18 vii;18 viii;18 ix;18 6;18 7;152;74;320",322";350, 352) underlying it measured at any point being at most 1:10; wherein the wear part (2;2';18;18';18′′′;18 iv;18 v;18 vi;18 vii;18 viii;18 ix;18 6;18 7;152;74; 320",322";350,352) is substantially cylindrical, the wear part comprising a surface that includes one or more depressions (8;8';20;27 iv;27 vi,29 vi;29 viii,31 viii;27 ix,29 ix;20 6,24 6;20 7,24 7;122;75;356) therein, the one or more depressions comprising one or more annular grooves (8;8';20;27 iv;27 vi,29 vi;29 viii,31 viii;27 ix,29 ix;20 6,24 6;20 7,24 7;122;75;356) extending around the substantially cylindrical wear part; wherein at least part of the connection member (10;10';22;334",336";358) having been pressed against at least part of the surface of the wear part (2;2';18;18';18′′′;18 iv;18 v;18 vi;18 vii;18 viii;18 ix;18 6;18 7;152;74;320",322";350, 352) that includes the one or more depressions (8;8';20;27 iv;27 vi,29 vi;29 viii,31 viii;27 ix,29 ix;20 6,24 6;20 7,24 7;122;75;356) therein; and wherein the wear part (2;2';18;18';18′′′;18 iv;18 v;18 vi;18 vii;18 viii;18 ix;18 6;18 7;152;74;320",322";350, 352) comprises a ceramic material, a cermet material, or a superhard material or a composite of a ceramic and a superhard material, or a cermet and a superhard material. 320",322";350,352) that is covered at least in part by a connection member (10;10';22;334",336";358), the wear part (2;2';18;18';18′′′;18 iv;18 v;18 vi;18 vii;18 viii;18 ix;18 6;18 7;152;74; 320",322";350,352) having a hardness of at least 15 GPa, and the connection member (10;10';22;334",336";358) comprises a metal or alloy, the connection member having a hardness less than 15 GPa, the connection member (10;10';22;334",336";358) being in the form of a sheet or being a cylindrical part, and the connection member (10;10';22;334",336";358) providing a layer over at least part of the wear part; at least part of the connection member (10;10';22;334",336";358) having been pressed against at least part of the surface of the wear part such that a surface (12;12') of the connection member (10;10';22;334",336";358) that faces a surface of the wear part (2;2';18;18';18′′′;18 iv;18 v;18 vi;18 vii;18 viii;18 ix;18 6;18 7;152;74; 320",322";350,352) follows the profile of the said part of the surface of the wear part (2;2';18;18';18′′′;18 iv;18 v;18 vi;18 vii;18 viii;18 ix;18 6;18 7;152;74;320",322";350,3 52) against which it has been pressed, whereby the surfaces of the wear part (2;2';18;18';18′′′;18 iv;18 v;18 vi;18 vii;18 viii;18 ix;18 6;18 7;152;74; 320",322";350,352) and the connection member (10;10';22;334",336";358) are co-operatively shaped such that relative movement between the two parts is substantially prevented at least during operation of the tool component; and wherein not only the surface of the connection member (10;10';22;334",336";358) that faces the wear part (2;2';18;18';18′′′;18 iv;18 v;18 vi;18 vii;18 viii;18 ix;18 6;18 7;152;74; 320",322";350,352) follows the profile of the wear part (2;2';18;18';18′′′;18 iv;18 v;18 vi;18 vii;18 viii;18 ix;18 6;18 7;152;74; 320",322";350,352) but also the opposed surface of the connection member (10;10';22;334",336";358);