I got tired of tangled air hoses hanging on wall racks but was too cheap to buy hose reels. Stumbled across this design on Instructables site so decided to build some. I made 4 reels from a single 4x8 sheet of 3/4" Radiata plywood and assorted pipe fittings and put them around my shop. They easily hold a 50', 3/8" hose. Key part is a $5 Harbor Freight swivel fitting. They work great and cost way less than half the cost of the commercial ones.