DoP Choice (SGQ40W40) 40x40cm SNAPGRID Compatible with SBM11 Softbox. DoPchoice SNAPGRIDS mount on the front of a SNAPBAG or a frost frame to control the spread of the light. Taking full advantage of DoPchoice’s patented instant set-up and self-tightening internal SNAPFRAMES, a SNAPGRID practically snaps out of its compact pouch ready to easily attach onto the interior lip of most popular softboxes, or simply affixes via hefty elastic strap to the corners of a frost frame and panel light.