These are available in various sizes including lab sized model. The most common size is 265mm diameter x 140mm, Height from 0.1mm hole diameter to 25mm hole diameter, sizes below 0.5mm and odd size perforation is achieved by laser perforation S.L.E. Technology. Also available in Triangular Grater (TG) and Spherical Grater (SG) with a complete set of Certificates.