Sioux 5979A Review: Sioux 5979A Pneumatic 70,000 RPM Pencil Grinder. I used this tool for at least 4 days a week for at least a few months for several hours a day until i sold it to a coworker when i bought a Dynabrade turbine powered 100,000 rpm pencil grinder....which really sucked and had little to no torque whatsoever. so it was usless to me and I completely regret buying that expensive p.o.s.. I used the Sioux to put some heavy edge breaks on some very hard metal parts. So I put alot of pressure on this tool alot. For ... Read more »
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