【Designed for LS-39/LS-38/LS-48 Spotlight】Crafted specially for use in the NEEWER LS-39/LS-38/LS-48 Spotlight Snoot, this iris diaphragm changes the size of the light beam emitted from the light. A cost effective gadget that enables your NEEWER LS-39/LS-38/LS-48 spotlight snoot even more versatility 【Adjustable Iris Diaphragm】 Adjust the diameter of the iris diaphragm from 5mm to 60mm to meet different spotlight requirements of various scenes 【High Temp Resistant with No Deformation】Made of premium and robust manganese steel for reliable and durable use during your photography experience. Note: Extended use at the smallest aperture may cause surface discoloration due to heat, but it won’t affect the leaf’s functionality 【Easy to Use】 Simply put this iris diaphragm into the drop in slot of the NEEWER LS-39/LS-38/LS-48 spotlight snoot, and rotate the handle to change the diaphragm aperture diameter, eliminating the burden of changing different iris diaphragms