Linhof Kardan 4x5 45G 45D 162x162mm Adapter To Speed, Crown Graphic Pacemaker 92.3x94mm 

The lens board has a stainless steel locking plate and spring-loaded screws to hold the Graflex Speed Graphic Pacemaker, Crown Graphic lens board firmly in place. There is a light Trap to prevent any light leaks. The back is painted mat back to minimize the reflections. 

This lens board is 3d printed, there are some marks do to the 3d printing process. The material use is PET Copolymer, 3 time stronger than ABS. It's a high quality material made in Italy with excellent mechanical property and temperature resistance (see the specs in the pictures). With normal use it is going to last a lifetime. 

For any question please contact me.