This is a machine element manufactured by Elesa & Ganter. It is a knurled wheel with a DVC profile that has a bore diameter of 3mm, a length of 20mm, a width of 14mm, a hub height of 30mm, a keyway of M6, and a clamping torque of 55 Nm. It is designed to be used with devices such as sprockets, wheels, cranks, couplings, and pulleys. It is suitable for both manual and motor-driven motion control and power transmission devices.