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Under-Sink Spray Bottle Hanger Rail
A 180 mm screw-on rail for the inside wall of an under-sink cabinet. It hangs three trigger spray bottles by the neck, so they stop tipping over in the cabinet base. Each 60 mm-deep shelf has a tapered slot that narrows from 34 mm to 22 mm, so necks of different sizes wedge in and the trigger head sits on top. Slots are on 62 mm centres. Four 4.5 mm holes take #8 (4.2 mm) wood screws, and four 45° gussets carry the load.
Under-Sink P-Trap Riser Shelf
A 140 x 95 mm riser shelf that slides in around a bathroom sink drain so the dead space beside the P-trap becomes usable storage — the 52 mm wide U-slot (26 mm end radius) clears common 1-1/4 in and 1-1/2 in tubular tailpieces and their slip nuts. Four hollow 18 mm legs give 45 mm of clearance over the cabinet floor, 7 mm drain slots let a drip pass straight through instead of pooling under your bottles, and each foot has a 4.5 mm M4 clearance hole if you want to screw it down.