We offer rugged marine-grade slip and lock-nut wrenches, that replaces the bolt wrench and sprocket wrench. This wrench will successfully replace both tools. Balance bolt wrench and sprocket wrench. Rugged yet versatile this wrench will clear the sprocket 's base of any tensioner pulley of any size. It will hold the balance shaft sprocket in its place and offer many other uses. It opens up to 3inches wide. Also with the wrench, the critical belt tension measuring gauge is included at no charge. It will measure the timing and balance shaft belt 's tension.