The L2.40950.0 from ARRI is for use with both ARRI T5 & ST2 Studio Fresnels. ARRI's barndoors come in a wide variety of sizes and fit all ARRI lampheads. In order to enable maximum control while shaping the light, ARRI offers 2-leaf, 4-leaf and 8-leaf barndoors from 3.1" (78 mm) up to 29.1" (740 mm) in diameter.