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The DIY Screw Clamps from IDEAL are a lighter weight version of the Heavy-Duty Malleable Cast Iron Clamp line. This lighter-weight version maintains all of the quality construction features of its heavier-duty counterparts. The hexagonal rail is ribbed for maximum holding power and the heavy-duty. Its cast iron arms are reinforced by strategically located webs for maximum strength making this clamp the ideal DIY screw clamp.