Wheelchair Anti Tip / Tilt Back Safety Fall Prevention - universal fit with 7/8" chrome tubing, spring loaded push-pin which locks into place, overall length measures 12", wheels measure 1 1/2" in diameter and are in great condition, this set of safety brackets are barely used and show minor wear. The top part with the push pin before the bend measures about 5 1/4" long, the lower part with the wheels measures about 7" from end to the bend.  From the top end to the push pin measures about 1 3/4". These are universal and fit most wheelchairs.  If you need more information let me know. Thanks.