How to connect two KALLAX shelving units into one - IKEA Hackers
KALLAX Shelf unit, white, 303/8x161/8" - IKEA
Amazon.com: ReplacementScrews Hardware Kit Compatible with IKEA KALLAX 2 x 2 Shelf Unit 602.758.12 - All Screws (104321) and Dowels (101339) : Home & Kitchen