Riders Passion Harley Stem Nut Mount Black Clock RP-DSCB CNC-Machined, aircraft grade 6061 T-6 billet aluminum mount is triple chrome plated for a show quality shine. Clock features stainless Steel case, mineral glass lens, and long life battery Clock is waterproof, shockproof & vibration proof and luminous hands & hour markers for night-time riding Installs in 5-minutes. It'll take you longer to get it out of the box than it will to install it. Fits Harley's with a stock 15/16" stem nut ONLY