Ridgid RID26891 1390M Threaded Rod Cutter 10mm 26891 The Ridgid 1390M Threaded Rod Cutter is designed to cut threaded rods used to hang pipes for air conditioning sprinkler installations and other lightweight frames from the ceiling. It makes clean cuts without damaging the thread. Ridgid 1390M Threaded Rod Cutter Blade Size: 10mm.