10x heavy duty garage door track rollers rolling gate sealed bearing idler wheels<br /><br />? specification<br />color:white<br />overall sizeapprox.:104mm/4.09￣l<br />diameterapprox.:45.6mm<br />detail size as shown in the picture<br />material:plastic and metal<br />oty:10<br /><br />? feature<br />1.100%  and high quality.<br />2.it is durable and convenient.<br />3. simple design and easy to use.<br />4.these rollers will quiet the door to an unbelievable degree and last longer than the door itself.<br />5.these rollers use regular motor oil in a dispenser for lubrication.lubricate the outside roller wheel and the door track・ roller bearings are sealed and need no lubrication<br /><br />? note:<br />1.we provide clear pictures・ measurements where possible. please check as much as possible to make sure the item is the one that you need.<br />2.please allow 0.5-1 inch difference due to manual measurement.1 inch=2.54cm<br />3.the color of the actual items may slightly differentthe listing images due to different computer sn・ thanks for your understanding.<br />4.no instructions included.professional installation is highly recommended!<br /><br />? package included:<br />10 x roller