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Each serrated gripping face is .79" (20 mm) square and can accept samples up to .79" (20 mm) thick.

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Shimpo FG-M6FTG20U Fat Chuck Tensile Grip

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Capacity: 100 lb / 50 Kg / 500 N Each serrated gripping face is .79" (20 mm) square and can accept samples up to .79" (20 mm) thick.