Size: step 2.4mm thread M8. 5 Pairs Crankset Bolts Crank Bolts Chainring Bolts Crank Screws Nuts. Crank set screws 5. Type B is usually used for mountain bike two-piece disc locking. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness.