1-3/8" Expanding Stem Grade 316 Stainless Steel Casters with 3" Hard Rubber Wheel
Expanding Adapter Stem fits round and square tubes with an inside diameter of 1-3/8 inch. Tighten topmost ring to compress rubber until it fits snugly into the tube. If necessary, further tighten with a wrench using the nut under the swivel until adequately secured.