5 Pairs Crankset Bolts Crank Bolts Chainring Bolts Crank Screws Nuts. Type C is usually used for single chainring locking. Crank set screws 5. Gross weight: 15G. Size: step 2.4mm thread M8. 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.