Adapter Block for DSLR and FSB Fluid Heads from Sachtler is designed to attach a DSLR viewfinder extension or external monitor to the fluid head on a tripod using the 3985 accessory adapter (not included). This adapter block is compatible with the Cine DSLR, FSB 6, FSB 6 T, FSB 8, and FSB 8 T fluid heads.