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Comparison : Item # 676-3, Starrett® EDP 56649 Magnetic Back
Item # 676-1, Starrett® EDP 56647 Magnetic Back
Item # 674-4, Starrett® EDP 52894 Back with Adjustable Mounting Bracket
Item # 672-4, Starrett® EDP 52889 Universal Back
Item # 672-3, Starrett® EDP 52888 Universal Back