Krown Lab, based in Portland, Oregon, has developed an clean-lined, economical line of sliding door hardware based on exposed industrial bearings running on flat rails. Baldur and Oden are both based on a stainless steel cast armature which can be top or surface-mounted to wood or glass doors up to 400 lb. on continuous tracks up to 19 feet in length. The Rob Roy (for doors up to 150 lbs.) is a machined stainless steel system provides more flexibility. Premium quality Gun Metal and Polished finishes are available.