Mountain Bike Chain Guide, Bike Mtb Chain Guide, Bash Guard, And Chain Protector Product Features aluminum 7075 CNC +ABS Plastic only for bike with 1x drive systems, for one-piece sprockets. Material: aluminum 7075 CNC +ABS .Weight?52g.Features: Durable, Lightweight, Anti-rust.Fashion and simple design,and with nice appearance. Easy to install, do not worry about drop a chain again and double your chain ring life for bicycle tube diameter 31.8 mm to 35 mm washer.We free give the spacer in the accessories,if you feel moves, please add spacers according to the second picture or video. Common sense: you occasionally need to check whether the screws are firm, this is for your safety Note: only suitable for ordinary bicycles?bike??mountain bikes, off-road bikes? NOT suitable for bicycles with lithium batteries. Shipping: Shipping is complimentary within the lower 48 US States. We Do Not Ship to PO/APO Boxes, HI or Alaska We Do Not Ship Outside of the Continental US All items ship within 24-72 hours of Payment For large items that require Freight shipping a valid phone number is required to call and schedule your delivery Terms of Sale and Feedback: Feedback is extremely important to us and If you are satisfied with our transaction, please take a moment to leave Positive Feedback. YOUR Satisfaction is our #1 Priority! If there are any issues, PLEASE contact us BEFORE leaving a neutral or negative rating so that we may resolve any concerns. We PROMISE we can make you happy if you give us a fair chance. Returns / Concerns: All items qualify for returns within 14 - 30 days of receipt. Buyer is responsible for return shipping on any item that is not damaged Please be sure this is an item you want before making your purchase. Customer Satisfaction is our TOP priority! All items are IN STOCK at time of listing. Inventory changes constantly and it is impossible to maintain a perfectly accurate count of all items. Please do not penalize us if we have to issue you a refund! Thank You For Your Business!