UShake Water Bottle Cages, Basic MTB Bike Bicycle Alloy Aluminum Lightweight Water Bottle Holder Cages Brackets (2 Pack) " 4 X M5 x 12 SCREWS INCLUDED: The screws are standard size for water bottle mounts to most of bikes with DRILLED HOLES, and washers are suggested for tight fixing. 6061-T6 HEAT-TREATED ALUMINIUM ALLOY: High quality material and manufacturing process for extra strength and durability combined with low weight, 2.1 oz (61g) each. EASY INSTALLATION: Use a 4mm hex key (included) to fasten cages in screw holes on frame. PLEASE NOTE - bike frame requires threaded holes for installation of cages. WATER BOTTLES FIT: 26 OZ water bottle can fit snugly; max bottle diameter is 3"(762mm). The water bottle cage has arms that wrap around the bottle for a secure and firm hold so you don't have to worry about it falling out during your ride. 10 YEARS WARRANTY: This product is covered by UShake's 10 YEARS Warranty " 6061-T6 HEAT-TREATED ALUMINIUM ALLOY: High quality material and manufacturing process for extra strength and durability combined with low weight, 2.1 oz (61g) each ANODIC OXIDATION: maintains black surface more durable and <span class="a-text-bold"><span class="a-text-italic"><u>NO SCRATCHES</u></span></span> to your water bottles. 4 X M5 x 12 SCREWS INCLUDED,: The screws are standard size for most of bikes with <span class="a-text-bold"><span class="a-text-italic"><u>DRILLED HOLES</u></span></span>. If it&#039;s not workable for your bike, please use your old screws or purchase separately from your local store. <span class="a-text-bold"><u>26 OZ </u></span>water bottle can fit snugly; max bottle diameter is 3&#034;(762mm). The water bottle cage has arms that wrap around the bottle for a secure and firm hold, which also allows you to <span class="a-text-bold"><span class="a-text-italic"><u>change the size</u></span></span> to fit different water bottles. CARRYING<span class="a-text-bold"><span class="a-text-italic"><u> 2 BOTTLES WATER</u></span></span>--help you to ride longer mileage without worrying about thirsty.