A gimlet is a tool designed to drill small holes in wood. It consists of a metal shaft with a cross handle at one end and a threaded point at the other. It’s a period charge, dating to 1548 in Vigil Raber’s Armorial of the Arlberg Brotherhood of St. Christopher, fo.30. The gimlet is palewise, point to base by default.
Matilda de Seton bears as a badge: A gimlet argent handled Or.