The DEWALT Pozi Bits have a hardened core for extra strength and durability. The design features extra grip ribs that grip the screw and reduce slipping (specific bits only). They are tough quality, professional screwdriver bits. This display contains 21 Tic Tac boxes, each containing 25 x PZ2 25mm bits. The DEWALT Pozi Bits have a hardened core for extra strength and durability. The design features extra grip ribs that grip the screw and reduce slipping (specific bits only). They are tough quality, professional screwdriver bits. This display contains 21 Tic Tac boxes, each containing 25 x PZ2 25mm bits.