JJC 3 in 1 Stacking Honeycomb Grid Modifier System for Canon 580EX/ 580EX II/600EX RT Flash & For YongNuo YN-560II/YN-565EX/YN-568EXII/YN600EX-RT/YN560 IV Flash The JJC Light Modifier was designed to produce 3 different size of light spread (Small, Medium and Large) when aligned and stacked two grids together, produce the smallest spots of light. Stack the small grid into the bezel to produce large size spots of light, for medium size spots of light just stack the larger size grid into the bezel. Gives you three different degrees of spotlight, can be used independently for the 25 degree or the 45 degree spots, or stacked together to create the 16 degree spot Dedicated Version for Canon 580EX/ 580EX II/600EX RT Flash & For YongNuo YN-560II/YN-565EX/YN-568EXII/YN600EX-RT/YN560 IV Flash