2 pieces: CRIT Rate.
4 pieces: Combat ATK stacks from critical attacks.
Read the linked source for exact values and activation text.
DRIVE DISCS / PATCH 3.2
Woodpecker Electro
CRIT equipment set.
CRIT
RECORD IDWOODPECKER-ELECTROFACT CHECKED
CRIT equipment set.
2 pieces: CRIT Rate.
4 pieces: Combat ATK stacks from critical attacks.
Read the linked source for exact values and activation text.