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Part No. Rail Size (in) Pad MAX Clamping Capacity (in) Throat (in) Weight (lb)
UF8NA * F Rail: 7/8 x 7/16 Standard 8.0 4.75 5.0
UF10NA * F Rail: 7/8 x 7/16 Standard 10.0 4.75 5.2
UF12NA F Rail: 7/8 x 7/16 Standard 12.0 4.75 5.4
UM12NA M Rail: 1-3/16 x 9/16 Heavy Duty 12.0 5.5 8.0
UM16NA M Rail: 1-3/16 x 9/16 Heavy Duty 16.0 5.5 8.8
UM20NA M Rail: 1-3/16 x 9/16 Heavy Duty 20.0 5.5 9.6

* UF8NA and UF10NA have been discontinued.