Don&';t spare your spare! U-Bolt the sucker, anywhere you can, because you never know when your trailer might hit the only nail on the road. 7/16" U-bolt design Accommodates 4 and 5 lug wheels Fits 8" thru 14" tires and most 15" 3" thread length - OAL 8-3/4" Zinc plated for lasting protection Fits all trailer frames up to 3" wide