This is a case opener for waterproof watches. Tips can adjust from 13mm to 56mm which can fit different size watch cases. Compact and small size, makes it very convenient to carry. 

Features:
Made of steel material, qualified with high durablity.
Tips can adjust from 13mm to 56mm which can fit different size watch cases. 
Water resistant and will not easily get rust or damaged.
Minimize the risk of slipping and scratching.
Compact and small size, makes it very convenient to carry. 
Widely used, great for waterproof watch case opening, batteries replacing and watch repairing.

Specifications:
Material: stainless steel
Item weight: 90g / 3.17oz
Package weight: 95g / 3.35oz
Item size: 7 * 3 * 1.3cm / 2.76 * 1.18 * 0.51in
Package size: 8 * 5 * 2cm / 3.15 * 1.97 * .79in

How to Use:
Turn the black knob and make it fit snugly around the watch face plate. 
Then roll the adjustment wheel of the Watch Back Case Opener to set the bit spacing to fit your watch's back case grooves.
Just turn it and your watch back case is open up.

Package List:
1 * Watches Screw-on Back Case Opener