easy to attach and detach blades for overhead ceiling fans . a first version has a ceiling fan blade with keyhole slots that fit over flat topped fasteners on a mounting arm . pulling the blade away from the arm locks the slots to the fasteners . a second version is similar to the first and has a decorative bottom cover having snappable tapered protrusions which attach through the keyholes and into mateable through - holes in the mounting arm connection . the third version has a protruding end portion of the blade that fits into a slot in the mounting arm where spring loaded pistons press into grooves in the protrusion end portion of the blade . latching handles allow users to manually move the pistons . a fourth version has a slot in the blade which fits about a mateable housing in the mounting arm where opposing spring loaded pistons press into interior wall grooves in the slot of the blade . a fifth version has the blade with slots fit over the end of the mounting arm so that pulling the blade from the mounting arm causes spring loaded piston to interlock into a interior wall groove in the slot of the blade .