Motion Pro Yamaha Spanner Nut Socket The Motion Pro Spanner Nut Socket helps you do the job right the first time. Features: Equivalent to Yamaha tool Ym-01507 Used for removal and installation of spanner (castle) lock nuts Premium quality high carbon steel Heat treated for strength and durability Durable hot black oxide finish Laser etched with Motion Pro logo and part number 1/2 inch drive 42mm OD x 36.8mm ID x 6.25mm Pin Width/6 pins