Edutek are offering a wide range of Optical Bench Accessories Iris Diaphragm for Physics Lab.
Specification of Optical Bench Accessories Iris Diaphragm for physics lab
A metal screen 75 mm diameter, with an adjustable iris diaphragm mounted in the centre, giving a maximum aperture of 6 mm. The disc is mounted on a 6 mm brass rod & the optical centre height is 80 mm approx