The park tool crank bolt wrench 14mm socket and 8 mm hex wrench is the ideal convenient wrench on a long comfortable handle perfect for any budding mechanic park tool crank bolt wrench features 14 mm socket and 8 mm hex wrench on a long comfortable handle suitable for many common square taper crank bolts 8 mm hex can also be used to install shimano spd and spd sl pedals that feature an 8 mm hex bolt axle design made in the usa and covered by park tool39s legen