Speed Nut for the failsafe return rod on Dillon Automatic Powder Measures. Easy and fast to install, adjust, and remove with the press of a spring loaded button. To install, align the holes and slide over the threaded end of the return rod. The button presses flush to install or release. The button pops out when locked into the rod threads. Can be twisted to thread up or down for fine adjustment or just press the button flush and slide this speed nut. Works with all Dillon Powder Measure Failsafe Return Rods.