How to Use: 1.Put the Watch Case Holder in place, adjust the white posts, turn the black knob and make it fit snugly around the watch face plate. 2.Then roll the adjustment wheel of the Watch Back Case Opener to set the bit spacing to fit your watch's back case grooves. 3.Just turn it and your watch back case is open up. Notes: When you put your watch into the watch case holder,ready to adjust the distance between the white ports and the black knob,be careful don't adjust too tight,it will clamp your watch. Package included: 1 x Watch Case Opener 1 x Watch Case Holder Preparetion: Unscrew the four white posts of the watch case holder(the yellow one),turn the black knob and make it fit snugly around the watch face plate.Specific steps are as follows: Fixed the watch: Step 1:Put the back of your watch into the watch case holder(the yellow one).Then install the white posts,adjust the distance between the white ports and the black knob,untill your watch fixed perfectly. Install the watch case opener: Step 2:Then ,roll the silver adjustment wheel of the Watch Back Case Opener(the blue one) to set the bit spacing to adjust your watch's back case width. Open the watch back case: Step 3:After you install the watch opener(the blue one),try to turn it,rotate from counterclockwise or clockwise.Then,you will find that your watch back case is open up.