Thanks for your comments guys.
Here's a rundown of the materials used.
Main stand portion: BJÄRNUM Bracket 11''IKEA | Wall shelves | Shelves & brackets | EKBY BJÃ„RNUM | Bracket
Headphone holder post: CAPITA Leg 4'' (bolt should not be longer than 19mm)IKEA | Built-in kitchens | AKURUM/RATIONELL system | CAPITA | Leg
Wire wrapping posts: ATTEST Knob (bolts should not be longer than 12.7mm)IKEA | Bookcases | BESTÃ…/FRAMSTÃ…/INREDA storage system | ATTEST | Knob
You need a 9.52mm (3/8") bolt (and a 10mm drill bit) to attach the CAPITA Leg to the BJÄRNUM Bracket. Plus 2 screws to secure the bracket to the base.
Bruno Barontini Bamboo Cheese Board With Handle