Mounting holes: 3.2mm diameter, for M3 screws Max Current: 25A (Enhance heat dissipation) safe for prolonged . active cooling of the heat sink. Colour: Black Material: metal + pc This module is a general add-on heated bed power expansion module for 3D printer. It can work with the Anet A8. The heat bed power module can be used in both Chitu motherboard and other open 3D printer motherboards. 25A maximum current: This module helps your 3D printer equipped with the Chitu controller board (capable of max 15A) become even more powerful. With this add-on module to board lead the maximum current up to 25A. When using heated bed 3D printer for 12V power supply which may cause excessive current during , with this module, it can well protect the connectors on the controller board from burning. This module is based on power MOSFET and will allow control of the heated bed (DC-DC Relays usually do not allow this). Package included: 1 x module Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.