You can make your knife holder any length you like, ours is 500mm. Divide the wood into sections, this is where your magnets will be glued. We divided ours into 14 equal sections from one end of the wood to the other. We spaced out our markings by 25mm and left a larger space at the end.
Clamp the wood to the workbench and put on your safety gear. Make sure you set the router to the right depth so you don't rout through the bottom of the wood. Working 10mm in from the edge, rout into the timber in the top of the first 25mm section. Then rout into the bottom of the second 25mm section. Repeat this pattern until you've routed all 14 holes and they are all offset.
Place a drop of all-purpose silicon into each of the holes. Insert a magnet into each hole and press it in gently.
Place a piece of painters' tape over each of the holes. This will stop the magnet from falling out. Leave the silicon to dry.
Use the 240 grit sandpaper to lightly sand the front and sides of the knife holder. Wipe away any dust.
Depending on the look you want, you can paint, stain or wax your knife holder. We're using a natural wax to highlight the grain in the wood. After applying the wax leave it to dry and then polish it.
Place the knife holder against the wall. Drill a hole at one end of the holder and into the wall. Push a wall anchor into the hole and drill into place. Then with the knife holder straight on your wall, drill a second hole at the other end of the holder. Secure that end using a wall anchor.
Your knife rack is now ready to fill up and use. The one we made can fit up to seven knives comfortably, but if you have more knives to store, you may want to build a holder longer than 500mm.