Thrashin Supply Risers are made of Domestic 6061 Aluminum and paired with ARP Hardware. The black finish is a hard anodized black with a Anti-Fade agent while the chrome finish is triple nickel plated (known as triple chrome) to withstand severe weather conditions, so the risers stay looking fresh for years to come. All of the top clamps are angled at 35 degrees whether your choose a pull back or straight riser. This gives the risers a stylish look and feel as well as making the new M8 Gauges read perfectly for the rider at any height.  	Fits on all models with 3.5" center on center riser spacing most OE Harley-Davidsons 	Works with any standard 1" handlebar, 	Top upper clamp bolts are 4.25 center on center 	Pull Back Risers feature 1.5" off Pull Back 	Sold in pairs with top clamp and 4 ARP Hardware included 5/16-18 x 1" 	Base hole tapped for standard 1/2​" x 13 mounting bolts (Bolts not included)(STANDARD SIZE) 	Made in the U.S.A.