This item is a good replacement for standard arm bolt. It works functionally with high quality aluminium alloy material. A wonderful accessory for cyclists.<br /><br />Features:<br />High quality aluminium alloy material? very durable.<br />Lightweight and easy to use.<br />Suitable for 20mm diameter of the tooth disc screw of the bicycle.<br />It is a good replacement for standard arm bolt.<br />Colorful style? suitable for personality modification.<br /><br />Specifications:<br />Material: Aluminium alloy 6061<br />Color: Red / Golden / Blue / Titanium / Black (optional)<br />Diameter: Approx. 20mm / 0.79in<br />Height: Approx. 12mm / 0.47in<br />Item Weight: 8g / 0.28oz<br />Package Weight: 11g / 0.39oz<br />Package Size: 13 * 9 * 1.2cm / 5.12 * 3.54 * 0.47in<br /><br />Package List:<br />1 * Bicycle Crank Arm Fixing Screw<br /><br />Note:<br />1? The diameter of the tooth disc screw is 20mm? so it can not fit for the 18mm diameter bicycle. It is fit for the bicycles with the same specification of 20mm.<br />2? Item color displayed in photos may be showing slightly different on your computer monitor since monitors are not calibrated same.<br /><br><img src="//img.tomtop.com/product/xy/2000/2000/p/gu1/Y/B/Y2097B/Y2097B-1-6b2d-wBoq.jpg" /><br>$$<img src="//img.tomtop.com/product/xy/2000/2000/p/gu1/Y/B/Y2097B/Y2097B-1-6b2d-7DE9.jpg" /><br>$$<img src="//img.tomtop.com/product/xy/2000/2000/p/gu1/Y/B/Y2097B/Y2097B-1-6b2d-exKU.jpg" /><br>$$<img src="//img.tomtop.com/product/xy/2000/2000/p/gu1/Y/B/Y2097B/Y2097B-1-6b2d-IH2C.jpg" /><br>$$<img src="//img.tomtop.com/product/xy/2000/2000/p/gu1/Y/B/Y2097B/Y2097B-1-6b2d-z9HS.jpg" /><br>$$<img src="//img.tomtop.com/product/xy/2000/2000/p/gu1/Y/B/Y2097B/Y2097B-1-6b2d-try2.jpg" /><br>$$<img src="//img.tomtop.com/product/xy/2000/2000/p/gu1/Y/B/Y2097B/Y2097B-1-6b2d-2jeG.jpg" /><br>