Used for removal and installation of spanner (castle) lock nuts. Equivalent to Suzuki tool 09940-14970. Large end socket dimensions: 50mm OD x 36.6mm ID x 5.6mm Pin Width/4 pins. Small end socket dimensions: 33.8mm OD x 25.6mm ID x 3.5mm Pin Width/4 pins. Premium quality high carbon steel. Heat treated for strength and durability. Durable hot black oxide finish. 1/2 inch drive.