this is a motor mount for commonly available 130 (toy) dc motor e.g.
https://www.pololu.com/product/1117
note that this is sized for a body size (excluding the axle and protusions at front and back) of
25mm length, 15mm height, and 20mm width(diameter)
the mount holes are spaced 26 mm apart
hole diameter of 1.75mm, and 10mm deep
this is sized for a 'wood screw' (i.e. self driving screw) of 2mm (M2)
https://www.amazon.com/s/ref=nb_sb_noss?url=search-alias%3Daps&field-keywords=m2+wood+screw
this makes it easy for you to mount it from the front e.g. to make a little fan, connect gears, pulley, etc
the motor front protrusion is about 1-2mm (excluding the axle), hence you could mount this on a plane surface (e.g. box , cardboard, plastic pane etc) of 1-2mm thickness, drilling a hole to allow the axle through
and drilling 2mm holes spaced 13mm from center/axle (26 mm apart) for the mounting screws