suitable for tempering all kinds of pencils: round, triangular, hexagonal graphite and colored standard format. has a practical system for adjusting the degree of sharpening the bit (5 varieties) allows for the best performance pencil. more la mina is hard (e.g. 3:0) must be sharper the tip (1 position)- for softer mines (ex. 3b) or colored pencils is better to choose an intermediate position.