4 New Pocket Watch Case Openers & Tools2 Rubber Vacuum Openers. This is a new set of 2 rubber vacuum case openers. Made of rubber and fits in the palm of your hand. These openers were designed for opening pocket watch cases. Each has two cup sizes for 0S to 18S watches Watch Knife. This is a new watch knife. This is a well made sturdy knife that makes opening watches with ease. This knife is a stainless steel watch case back remover. It has a PVC rubber handle. It measures approximately 4 1/2" (114 mm) Dust Blower. This is a new dust blower. Insert nozzle inside any watch stem hole and squeeze the bulb and it will blow out the crystal without damaging it. Just squeeze for a blast of air. It is great for watches and jewelry. It measures 4 1/2" (114 mm).