Machine tools, cut-off-machines, high-speed cut-off machines, grinding machines, high-speed grinding machines, abrasive and cutting-off machines, high-speed abrasive and cutting-off machines, lathes; tools (machine parts) for machines tools, particularly grind discs, cubic crystalline nitride (CBN) grind discs, diamond grind discs, grind disc adaptors, carcase for rings of grind disc; coolant supply devices for grind discs (as machine parts), particularly coolant supply devices to match the grind disc contour