4x4mmD connection for use with TWM & TWE. Requires 1.25mmD hex tool for insertion/removal of screw only - HT1.25S, HT1.25, HT1.25L, HD1.25, PK-30. DIRECTguide™ Conical Replacement Screw - 3.0CRS. System: InterActive, simplyIconic, SwishActive