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Tend Industrial Knowledge Center / Product comparisons Looking for the best 5-inch air angle grinder for a professional workshop? Shinano deserves a place on your shortlist—but the model number matters as much as the brand. This review explains the SI-AG5 industrial range, the separate SI-2515LA, and the accessory decision that is easy to overlook: M14×2 versus 5/8-11 UNC. Quick verdict: a compelling professional choice Our buying recommendation is to shortlist Shinano when you wan …