Description: This part was designed for M4 threaded ball screws Use it with M4 ball screws and magnetic joints Compatible with U-shaped hotend mount Aluminum Fisheyes Effector can be used for various 3D Printer High qualty, environmentally friendly and durable Package Includes: 1 x Aluminum Fisheyes Effector for Delta Type 3D printer Note: Please consult with the supplied drawing for dimensions, mounting hole placement and thread sizes, to determine compatibility with your 3D Printer