Sizes:

MP-PLUG-2: 1/2-20UNF Hole Plug (1.82″L)

MP-PLUG-3: 1/2-20UNF Hole Plug (3.7″L)

MP-PLUG-4: 1/2-20UNF Hole Plug (4″L)

MP-PLUG-6: 1/2-20UNF Hole Plug (6.7″L)