Scale: 1/500

Set includes 3 turrets with separate trunnions.  No barrels.
 
These models represent the triple 8"/55 cal., 250-ton turrets of several heavy cruisers of the US Navy's Portland and Northampton classes, specifically:
USS Northampton CA-26
USS Chester CA-27
USS Lousiville CA-28
USS Chicago CA-29
USS Houston CA-30
USS Augusta CA-31
USS Portland CA-33
USS Indianapolis CA-35

These turrets are not suitable for USS New Orleans CA-32 or USS Astoria CA-34.  Those ships had 8" turrets of a different shape.

Features:
overall dimensions precisely scaled from US Navy O.P.1112 (2nd Rev.) "Gun Mount and Turret Catalog" drawings dated 15 January 1945
accurately shaped armored rangefinder hoods
four crew access doors and 172 hex-head exterior bolts properly positioned, sized and correctly placed according to photos of the actual turrets
separate trunnion, slotted for your favorite brass barrels (not included) to allow you to position the guns to any realistic elevation from -5 degrees to +40 degress just like the real turret
 
© Model Monkey LLC.  This 3D-printed product may not be copied or recast.
 
From Wikipedia: "The 8"/55 caliber gun (spoken "eight-inch-fifty-five-caliber") formed the main battery of United States Navy heavy cruisers and two early aircraft carriers. United States naval gun terminology indicates the gun barrel had an internal diameter of 8 inches (203 mm), and the barrel was 55 calibers long (barrel length is 8 inch × 55 = 440 inches or 11 meters).

"Mark 9: These built-up guns weighed about 30 tons including a liner, tube, jacket, and five hoops. A down-swing Welin breech block was closed by compressed air from the gas ejector system. Loading with two silk bags each containing 45-pounds (20 kg) of smokeless powder gave a 260-pound (120 kg) projectile a velocity of 2800 feet per second (850 m/s). Range was 31,860 yd (29,130 m) at the maximum elevation of 41 degrees.

"Mark 14: These guns were similar to Mark 9, with the same shell weight and maximum range, with a smaller chamber and rifling twist increased from 1 in 35 to 1 in 25 in a chromium-plated bore."