Where can I buy plastic inserts for square tubing?

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I'm trying to find some black plastic inserts, which I think would be called Plastic Inserts or Glides to use as end caps for 1, 1 1/4, and 1 1/2 square tubing?  I'm building some hand rails and would rather not cut, fold, and weld the ends shut.  I've seen these on ready made applications, but have failed to find anything online for most of these sizes.Striking out in all the places online I thought would have them.  My immediate need is for the 1 1/4 size.............Thanks for any leads you can provide.Ron
Reply:http://www.northerntool.com/affiliates/onlinemetals/try this site!
Reply:Here are some places that carry this stuff:https://reidecom.reidtool.com use their search feature for "end caps"http://www.outwater.com/hope this solves your problem.
Reply:If you get serious about this, the two big manufacturers of plastic end caps are:CapPlug- http://www.caplugs.com/catalog/starp...27&classid=222and Pro-Tec/Alliance-http://store.allianceplastics.comYou have to buy in bigger quantities- 200 to 500 pieces, depending on the size, but you get the absolute best price. Both of these companies sell caps for inside or outside every size of round bar, pipe and tube, along with really cool inside caps for square tubing with built in furniture glides.I used to make a lot of furniture from 5/8" round bar, and I could get 1000 end caps for maybe 50 bucks, versus something like 50 cents each at the home despot.
Reply:Home Depot has them