Allows to quickly evaluate the distribution in size diameter of a sample according to the 4 sizes,
Consists of a set of drawers with a bottom drilled to the diameter of the caliber to be spread.
2 models available:
-12mm, 12-14mm, 14-16mm, +16mm or -17mm, 17-20mm, 20-23mm, +23mm
Quick and easy to use.