Description: High quality 100% Brand New Easy to install and useful adapter These adapters will screw into your 8mm clockwise threaded mirror mounting point and then you will be able to mount the 10mm mirrors. Thread Diameter: 8mm/10mm Screw thread: Right-handed (LH) thread / Right-handed (RH) thread Specification: Color: Black Size(L x W): 26 x 15.5 mm/1.02 x 0.61 inch Material: Steel Metal What is RH and LH screw thread and how do I know which one should I purchase? When seen from a point of view on the axis through the center of the helix, moves away from the viewer when it is turned in a clockwise direction, and moves towards the viewer when it is turned counterclockwise. This is known as a right-handed (RH) thread, because it follows the right hand grip rule. Threads oriented in the opposite direction are known as left-handed (LH). In brief : Right-handed (RH) thread: Tighten the screws in a clockwise direction. Left-handed (LH) thread: Tighten the screws in a counterclockwise direction. Fitment: Fits Most Motorcycle, Street Bike, Cruiser & Chopper Models. Package Includes: 2 Pieces Motorcycle Rearview Mirror Adapter Bolts Note: 1.Please allow 0.1-0.3cm differences due to manual measurement, thanks. 2.Please understand because of the light irradiation or computer display difference, so I can't guarantee photos and real color is 100% the same.