This wrench is designed with a rugged 10 mm haldle (the thickest handle on the market) for an environment where extra durability is essential.  The specially grooved pins to hold the camshaft pulley stationary while loosening and tightening the center shaft bolt.  While useful on most Asian overhead cam engines,  it is most needed on transverse mounted V6 engines such as the VG30 used in Nissan Maximas, as well as, the 3VZFE and lMZFE engines used in Toyota Camrys.  The rear pulleys on these models are in very close  proximity  to  the  shock  tower  making  removal  and replacement difficult without this locking device.