of the 3 watch back removers the one in this set works the best  bought the 3 prong remover first; loose adjusting didn,t  like, also had missing parts returned no problem and ordered the 16 piece set and the blue 2 prong back remover--2 prong works 0k but the adjustment is loose but for the price i kept this too  the back remover in the set is also easier to adjust and a better buy