What happened? After Pressure Testing (PT) the 11”-5K shooting nipple, Derrick man and FM unscrew the ACME coupling of the Pressure Testing (PT) cap, pick it up to the RF using the winch and remove the ACME coupling from the PT cap by hands from below. They laid down the ACME coupling on the RF and picked from the top side. When they tried to install it on the shooting nipple Crossover (XO); the ACME coupling slipped from the FM side and the DM middle finger got trapped between the ACME coupling and the shooting nipple Crossover (XO). Why it happened/Finding : SOP is not available for the activity Pinch points were not identified and marked Same coupling was used for pressure testing of the shooting nipple cap and on the shooting nipple crossover. Impact gloves were used during the activity Generic TBT and TRIC Card was done but not specific to the task.