This Economy Line watch case opener is made from solid steel and comes mounted on a wooden board. Designed to open/close screw-back style cases, this set comes with 6 pairs of assorted chucks, 4 pairs of plastic reversible case-holding jaws and 1 key with max opening diameter of 60mm.

Case-holding jaw sizes: 9mm/11mm, 13mm/15mm, 17mm/19mm, 20mm/22mm