Machined from: domestic 6061 t6 extruded aluminum. Finish: matte black. Mounting hardware: hex head screws and wrench provided. Center spread: 2.45". Overall length: 5.882". Our winchester 88 mount is made specific to the gun. These mounts are available in 0 or 20 moa. Please see our faq section for more information on deciding which moa is right for you. Picatinny cross slots run the full length of the rail, which gives the shooter flexibility when mounting scope rings and other accessories. The channel in the center reduces the overall mass of the mount, weighing in at 2-3oz on average. Also, in many cases, it will not obstruct usage of factory iron sights. Egw's one piece scope mounts are the obvious choice for hunters and tactical shooters alike. Add egw's practical or hd scope rings to make it a complete overhaul! available in matte black. Custom silver anodizing is available upon request, at an additional charge of $15 (there is also a 3 month lead time associated with silver anodizing. Please give us a call if you'd like to place a custom order). This mount is a picatinny-style base and compatible with picatinny or weaver scope rings. Installation: egw recommends 20 inch lbs of torque and a drip of blue thread locker (sold separately).