Assembled it is 13-3/4" 

34.9cm Overall Diameter

Typical of tables built from 1900s on - some still in service today 
 
 Fits most engine terminals 
 
 Holds locos up to 12-3/8" (31.4cm) long 
 
 User-friendly, illustrated instructions simplify operation & programming 
 
Layout mounting templates for pit & Cornerstone Turntable Control Box 
 
 Control Box included for use on layouts with DC or DCC train control 
 
New Cornerstone Turntable Control Box for simple operation & programming with: 
 
- Programmable indexing for up to 99 different tracks 
 
- One-touch 180-degree bridge rotation in either direction 
 
- Simplified LED display with adjustable brightness 
 
- Operable from up to four remote locations with additional Control Boxes (#933-2320 each sold separately) 
 
 Comes complete with motor & Control Box, operates on 12-18v AC, 16-24v DC power supply (power supply not included) 
 
Comes with Code 83 rail installed on bridge 
 
Optional: To control turntable operation with DCC throttle or serial UART controller, purchase Cornerstone Advanced Control Module (933-2321, available separately) 
 
Requires 12-3/4" (32.3cm) mounting hole 13-3/4" (34.9cm) overall diameter