Discover with Dr. Cool Replacement Rock Tumbler Barrel for National Geographic Professional Series Tumbler and Hobby Series Tumblers, 2 Pound Rock Polisher Barrel with Leak-Proof Lid

So glad I found this! It works perfectly with the Nat Geo rock tumbler.

Works well as replacement for my National geographic rock tumbler. I use it for milling antique muzzleloading propellant.

I have the grey National Geographic tumbler kit. Came with the small barrel that holds roughly a cup. This one is of the same build and quality. Seems about 3x the size. I don’t think you could go any bigger and still fit on the machine.

I got this as a spare for my National Geographic tumbler. It's much smaller than the original, but it still works (although it spins at a faster rate due to the smaller size). It's really sturdy and I'm very pleased with it. It's handy for smaller batches.

Very good product, but the metal threaded stud on the lid that the knob screws to, just broke off n started spinning while on the tumbler...wound up causing me to have to cut it open to get my rocks out.!!! The plastic knob wouldn't come off.!!! I gave 4 stars, but would've given 5 if that hadn't happened.!!! Just one that wasn't tack-welded very good.!! Then to compound it, Amazon sent me another for free and it was lost in transit to SC in Concord, NC. They just eventually replaced my money & I bought one to replace it with the credit from Amazon.!!!

Works good

Great replacement for the tumbler that came with my NG kit. It seems to be better suited for the unit - it APPEARS to move faster - I MAY be wrong, but it somehow gets the job done more quickly on cleaning beads (about 20 mins). Love it

Once I have finished steps 1 and 2 with the heavier grits, the rock load is reduced quite a bit so this smaller size is perfect for the polishing stages. It works perfectly on the National Geo tumbler I have and the lid seals great. So far it's held up really well but if it tanks, I'll come back and say so in an update. So far so good.