SmallRig Tripod Mounting Plate W/15mm Railblock 1797 is a baseplate that provides 15mm lightweight rod opening for DSLR cameras when combined with the SmallRig cage. The baseplate can attach to any tripod plate or Manfrotto and Arri standard bridgeplate. In addition, it features built-in rubber cushions to prevent your camera from scratching. It also features various 1/4’’-20 and 3/8’’-16 threaded holes for mounting accessories. The unique groove allows 40mm adjustment for balance control.