Use these sturdy universal DIN rail mounting plates to mount devices to standard 35mm DIN rail. They feature a flat plate mounting surface (4.0" x 4.0") to which you can mount your device. A sturdy steel DIN rail bracket comes installed on the back of the adapter plate. The steel bracket provides a secure installation while still allowing the plate to be easily removed from the DIN rail. The mounting plate is made of sturdy 0.125" thick FR4 material (glass-reinforced epoxy laminate material). The plate features 36 pre-drilled mounting holes (0.165" diameter, 0.5" center-to-center spacing). The plate material is sturdy yet easily machinable to accommodate adding your own device mounting holes if necessary. While this product features a pre-drilled plate, other part numbers feature a solid plate or slots for velcro straps.