The 12x12 HomeRunner Juntion Box is available with two choices of cover.  The Oversize Cover (for flush mount installations) and the Box-Size Cover (for surface-mount installations).
 
Patented Grady Box External Clamps
One oversize clamp accepts up to 12 conductor/10AWG MC feeder
Ten smaller clamps accept 14/2 to 10/3 AC, MC, MCI-A and NM cables
Positive ground; ideal for MCI-A cable like Southwire MC-AP
Mounting holes and knockouts provided for installation flexibility
No drilling or cable connectors needed
 
Volume:  544 Cu. In.
Wire Fill:  (270) 14 AWG
               (240) 12 AWG
               (216) 10 AWG
Built-in Clamps:  (1) 10/3 to 10/12
                           (10) 14/2 to 10/3
Knockouts:  (9) 1/2"
                    (8) 1/2" - 3/4" eccentric
                    (6)  3/4" - 1" eccentric
                    (6)  1" - 1 1/4" eccentric
Dimensions:  12"H x 12"W x 4"D