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Comparison : Item # AP-1032M-B, AP Series 10-32 Thread Size Unified National Fine (UNF)/National Pipe Thread (NPT) Allen Plug
Item # AP-1428M-B, AP Series 1/4-28 Thread Size Unified National Fine (UNF)/National Pipe Thread (NPT) Allen Plug
Item # AP-1M-B, AP Series 1/16 Inch (in) Thread Size Unified National Fine (UNF)/National Pipe Thread (NPT) Allen Plug
Item # AP-2M-B, AP Series 1/8 Inch (in) Thread Size Unified National Fine (UNF)/National Pipe Thread (NPT) Allen Plug
Item # AP-4M-B, AP Series 1/4 Inch (in) Thread Size Unified National Fine (UNF)/National Pipe Thread (NPT) Allen Plug