Upgrade Your Bike with Our Premium M19 Crank Arm Screw Enhance your bicycle's performance and reliability with our high-quality M19 Crank Arm Screw. Crafted from superior aluminum alloy, this crankset bolt offers precision strength that far exceeds traditional plastic screws, ensuring a longer lifespan and enhanced durability. Compatible with a wide range of mountain bikes, including models equipped with M4000, M590, M596, M661, SLX, XT, and XTR crank pairs, this screw is designed to fit seamlessly. Installation is a breeze with a standard 3/8 inch hex wrench, and its precise dimensions—19mm thread diameter, 28mm nut diameter—guarantee a perfect fit. Your satisfaction is our priority; if you have any issues, we're here to help with replacements or refunds. Choose quality and reliability for your bike's crankset with our M19 Crank Arm Screw.