Size #2 crimp tubes. 0.70 in, Approx. 80 crimp tubes. Use with wire/beading cable that is .33 mm to .61 mm (0.013 - 0.024 inches - in other words, fine, medium and heavy.)
Crimp tubes are how to finish the end of a beading wire and attach a clasp. Slide the crimp tube on after the last bead, add a jumpring or the loop of the clasp directly, then go back through the crimp tube with the beading wire. Crush the tube flat with your pliers, or better, use crimp pliers to crimp and fold the crimp into a nice, secure completed crimp.
1.7mm x 1.7mm Hole size is approx. 1.5mm. By the pack of 1.5 grams.