Square holes in straight rows (Qg) have grown in importance particularly in the recent past; this pattern is often used for claddings and enclosures. The square hole in staggered rows (Qv) are not offset by 60° one to another, since the definition of the pitch differs from that for staggered round perforation. This hole shape is used particularly for sieve plates. Square holes in diagonal rows (Qd) are rotated by 45°. This pattern is often used for decorative purposes.