Bicycle Crankset Tool 2023 New Mountain Bike Axle Puller Bicycle Repair Tool Kit Multifunctional Chain Cutter How to use: Step 1: Remove the cover on the chainring. After removing, you can see the bottom bracket screw. Step 2: Use the 14mm sleeve function of the crankset tool with a 16mm open-end wrench to remove the bottom bracket screw. Step 3: Remove the bottom bracket screw and set it aside. Step 4: Screw the black headgear into the chainring. Make sure to screw it to the end to avoid damaging the threads on the chainring. Step 5: Fully tighten the black headgear. Step 6: Screw the silver top rod into the headgear by hand until fully seated. Step 7: Use a 16mm open-end wrench to further tighten the ejector rod. It may require extra force, but continue tightening until secure. Step 8: Once the ejector pin is fully tightened, the chainring will be removed. Specifications: Product name: Crankset tool / square hole puller / remover / crank remover Name: Bicycle Crankset Tool Material: 45# carbon steel, quenched for increased hardness, chrome-plated surface Function: Designed for disassembling bicycle chainrings. Features an extended ejector rod for removing square taper and spline-type cranks. Practical and convenient for bike maintenance. Weight: 120 grams Name: Bicycle Bottom Sleeve Material: 45# carbon steel, nickel-plated surface Size: Length 4.8cm, maximum diameter 3.2cm Weight: 100g Product Name: Chain Cutter Product Weight: 128g Product Details: Made from 45# steel with quenching heat treatment for high hardness Package Included: Bicycle repair tools * 1