Pick Up Tool Four Prong Tweezer - SFC Tools - 57-635 The pick-up tool is great for retrieving and positioning small delicate parts like gemstones, rivets, and beads. It has a spring loaded plunger which pushes out and retracts 4 bent steel prongs; perfect for picking up faceted stones. Opens to a diameter of about 20 mm (0.75). Overall length is 11.2 cm (4.38).