This is a wasp trap, It is more compact than its previous version ( https://www.thingiverse.com/thing:4263483 ). - the inside cap diameter is 63mm, - the screwing part contains 4 edges evenly space 3 mm apart (12mm for a single helix). Features: - easy opening (screw on regular jar), - a hole on top to let a string pass, - protections prevent rain water to fill the trap.