Replacement Drive Belt for Thumler's AR 1,2,6,12 B #401 Rock Tumbler-3 Pack (B1000-342)

Disliked the breaking issue after one week. The original belt lasted a year the first replacement belt lasted a week. Buy a different brand.

These belts fit the Thumblers model B tumbler perfectly. After trying several "make do" drive belts for vacuum cleaners, rubber bands etc. It was a relief to have a drive belt that fit and worked perfectly. They should last well but I will order these again as needed.

The seller was very prompt and the item fits perfectly on my rock tumbler

The last few belts have lasted only 10 days each without breaking so we'll see if these are better.

Perfect fit for a Thumler model B

I used two belts right away and with in a week one broke and was cracked it three places. I then replaced that one and the seller said they would replace it, great. I checked the tumblers and found the other two belts had cracks all over the place, one I counted 8 cracks in it before it also broke. The last belt has cracks in several place and how it is still running I have no idea. My previous belts lasted for years before they gave out, these must be very old or very cheap junk. Now I will have to find new supplier for belts.

Belts ordered to replace original Thumler B model. When the belts finally arrived, I put one to use immediately. It is quite a bit smaller in diameter from original but is working hard tumbling rocks for six days now. I will update review later and if appropriate will up the overall rating for durability alone.

I am so glad I got these. They are perfect. I love that I could use it for the retainer ring also instead of having to buy two different items. It's only been a day so I can't speak to the longevity, but so far so good.