Bosch Meat Grinder 4.5 MM Disc.   

 When you purchase the Bosch Meat Grinder attachment for the Universal mixer, it includes a 4.5mm disk, a good size for making hamburger. (The millimeter size refers to the diameter of the holes in the disk.) The small 2mm disk is for mincing. For large chunks, use the 8 or 13mm disks. 

Available in 2mm, 3mm, 4.5mm, 6mm, 8mm and 13mm. 

Meat grinder disks are also referred to as meat grinder plates   This 4.5  disc will do hamburger, mincemeat, relishes etc.