Requires 1.25mmD (HT1.25S, HT1.25, HT1.25L, HD1.25, PK-30) or Off-Axis drivers (HT1.3SB, HT1.3B, HT1.3LB, HD1.3B). Fixation screw w/1.25 hex - 1000-20B. System: SMARTbase for Legacy