This is a Watch Case Opener which opens and closes back of water resistant watches. The professional Watch Back Opener is made to easily open any type watch or brand watches with a non screw watch case. The adjustable jaws of the Watch Cover Opener will safely fit your watches and incorporates a long handle with sturdy construction to eliminate the risk of slipping. Great affordable way to change watch batteries or inspect watch movements by this Watch Repair Tool. Max diameter:36.5mm/1.44" Max width between two pins: 52mm Mini width between two pins: 14mm Length: approx. 144mm/5.67" Package size:150*65*35mm/5.91*2.56*1.38" Usage: Open the back cover of a watch 1 cm = 0.3937 " Note: 1. Please allow 1-3cm differences due to manual measurement. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item.