Comparison : Item # T1 1.16" Dia T-Knob - Med Hub, 1.16" Dia. T-Knob (T1)
Item # T1A 1.16" Dia T-Knob - Short Hub, 1.16" Dia. T-Knob (T1)
Item # T1C 1.16" Dia T-Knob - Long Hub, 1.16" Dia. T-Knob (T1)
Item # T1D 1.16" Dia T-Knob - Molded Threads, 1.16" Dia. T-Knob (T1)