Amazon.com: The Bed Slats Company M6 x 14mm Cross Dowels Barrel Nuts with 140mm Furniture Connecting Bolts for Bunk Beds Cots - Set of 16 : Home & Kitchen
Steel Cross Dowel by Woodpeckers
Set of Four (4) Pairs of Cross Dowels and Bolts (for furniture, or IKEA) | eBay