Machined from: domestic 6061 t6 extruded aluminum. Finish: matte black. Mounting hardware: hex head screws and wrench provided. Center spread: 3.259" Overall length: 6.276". Our winchester 70 mounts will work for any short action, long action, wsm or wssm mount. *the winchester coyote edition chambered in243 will require our wsm mount.* the middle spread is the distance between the two middle holes, center to center, on your receiver. The middle spreads on our winchester 70 mounts are as follows:. Winchester 70 short action: 3.259" Winchester 70 long action: 3.805" Winchester 70 wsm: 3.514" Winchester 70 wssm: 3.225" 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! . 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).