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Well we had a chance to try out the new cobra crusher  and here is a quick review First I want to start by saying that all in all it seems to be a nice product it will crush smaller rocks with ease it really works great on quartz...also dry rocks work better then wet rocks ..we did notice if we loaded it up to much when we started that it jammed on us but the jams are so easy to clear .....also it is recommended that you use a 10 amp angle grinder anything smaller might not get the job done ..and if you are using a extension cord make sure it is a commercial grade cord like a 15 amp cord like contractors use ...I think this product would be great for small sampling and for grinding your black sands also even small computer parts there one thing we would like to see added that would be some kind of collar around the shaft for safety but even without it still a great item changing the chains inside the crusher would be a breeze if they ever wear out but all in all I would like to have one in my equipment box for sure I think it would last a lifetime .if you are interested check out there website at Cobracrusher.com  there are even a couple videos on youtube showing it in action so use your own judgement and if you need to crush alot of small stuff then this might be for you