【High Quality】The Oldham Coupling is made of brass for reduced friction and sufficient strength,produced by a CNC machine with high precision, resulting in minimal joint clearance between the three parts and low inertial movement. 【High accuracy 】 The OD is 22mm and the center distance between the two holes is 16mm, please must measure your leadscrew nut mounting hole distance before purchase. 【Function】If the lead screw is not straight, the printing accuracy will be a problem, then this kit will solve it. High torsional stiffness to protect the follower and support bearing, used to avoid the effect on large radial deviation. It is used to improve printing quality and avoid problems caused by hot bed oscillation during printing, such as subtracting the effect of clearance when the lead screw is not straight during printing. 【Wide Compatibility】Compatible with VzBot 3D Printer, BLV 3D printer and other 3D printers with T8 lead screw Z axis which is using 16mm center distance installation hole lead screw nut. 【Package】 1(2) set of Oldham coupling,1pcs 2mm wrench.