Engages the 16 notches of the external bearing cups. Small plastic tool engages the 8 internal splines of the crank arm adjustment cap & engages 16 notches of the external bearing cups for Shimano BB 9000 for easy removal or installation. * Shimano is a registerted trademark of Shimano Inc. TOOL MATERIAL Cr Mo steel / Engineering grade polymer SIZE ø5.2 x 4 cm / ø2” x 1.6” (2 pcs) WEIGHT 137 g / 4.82 oz (2 pcs)