TORX TX25 T25 PIN DRIVE. TO DRIVE THE SCREWS YOU CAN ONLY USE T25 TX25 PIN TYPE TORX SECURITY BITS. BUTTON HEAD - SELF TAPPING SCREWS. 4.8 X 19mm. CROSS HEAD PZ2 SOLID SECURITY TAMPER PROOF 6 POINT STAR 6 POINTED STAR SIX POINT STAR SIX POINTED STAR BIT PRECISION.