Professional piercers can ease their job thanks to these smart tweezers.
This tool measures 5.75" (14.6 cm) of length. The head is 3/8" (9 mm) and the hole approx. 3/16" x 5/16" (5 x 8 mm). The little slot measures 1/16" (2 mm). 

These tweezers have a smart sliding lock system.