Bike Computer Mount ( Handlebars). Weight:120g (4.20z). Dimensions:115x53x28.5mm(4.5x2.1x1.1in) How to use Bike Computer Mount ( Handlebars) Select a Computer Mount according to your model, theninstall onto the Bike Computer Mount, and tighten the screwswith a 2mm Hex Wrench. install the Bike Computer Mount to the front of the bike andtighten the bolts with a 4mm Hex wrench. Notes: The Bike Computer Mount can be installed on the upper orlower side of the front of the bike as needed. Remove a pair ofbolts (upper side or lower side) from the bike, select 30mm or 40mm M5 Bolts according to the length of the hole, and useeither the long or short screws and their posts to mount theaccessory over the centre of the bike, ensuring the bolts arecompletely fastened and flush with the post. lf you are notsure which bolt to use, try the long bolt first. lf the long boltdoes not fit, replace it with ashort bolt..When installing, pay attention to the direction of the bolts, sothat the bolts are installed directly into the Screw Posts.When tightening bolts, if using a torque wrench, 5Nm isrecommended, otherwise tighten to mount is firmlyattached to the handlebars. The spacing between the holes of the Bike Computer Mountis 11-39 mm. that the two bolts are both locked on the BikeComputer Mount. lf there is only one bolt hole on thehandlebar, or the spacing is not sufficient for the installationof the Bike Computer Mount, do not use the mount, as thismay fail and causedamage to your camera. Install the camera (or accessories such as a flashlight) on the1/4inch screw or three- connector of the Bike ComputerMount. colour: Black Material: Aluminum Alloy + Plastic + Stainless Steel Package Contents: 1 * Stand body 1 set * accessories Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.