#TWTH-SET Plezia Tap Handles - 2 Piece Set - Long & Short. Same Capacity, two different lengths. Intended for Tap Sizes (Inch) #0 to #6 and (Metric) M16 to M3,5. The square hole is for 3,0mm (.112") Size tap squares. Each handle has 3,0mm (.112")Square hole - different sized handles are for different sized taps and the 'feel,' that the end user prefers. Handle fits over the tap and provides for outstanding feel and control. These are an outstanding addition to anyone's tool box!