The Custom Brackets Flash Plate for Quantum Qflash T4d/T5d Flash (FQ-1) is designed to be used with the Quantum T4d/T5d flash. Quantum-Q Flash T4d, T5d QRS, QRS-35-H, QRS-H2 must be modified to use with these flashes. Use either CK-701 or CK-702 For Digital PRO-M, Digital PRO, QRS-H2, QRS-E2, QRS-2 brackets only.