2Inch (50mm) Square Plastic Hole Plugs Insert (20 Pack), Heavy Duty Black Hardware Plugs and Unistrut End Caps for Square Tubing, Glide Insert for Pipe Post, Chairs and Furniture by Prescott Plastics

These were GREAT! Nice finish, workmanship, and pliable enough not to crack upon install. Accurate dimensions (ID/OD) and easy install. Its a pleasure when caps are well made, finished, and fit correctly, as is the case here, and aggravating if poorly made hard plastic that cracks and fits poorly (NOT the case here - these are EXCELLENT!). Comes in a resealable storage bag which is a nice touch.

These fit perfect in 1 O.D. Aluminum tubing @ 1/16 (16 gauge ) thickness. I tap them in with a rubber mallet and I doubt that they EVER fall out!! They are great quality , they are so good, I ordered a extra lot so I never run out.

Works perfect for the gates that I build.

Fits perfect.

everything about it

Great product, works as intended. Used these to fill ends of aluminum tubes on new Kayak rack.

great product..fits perfedtly

I used these end caps to close off the box tubing on my trailer. The light wires are inside the tubing and debris was constantly gathering inside. Helps the looks of the trailer also.

perfect fit

Replacement part for a tube end. Fits great. Advertised measurements are correct.