Image Item No. Description  53586  Technic, Axle and Pin Connector Perpendicular with Extension Catalog: Parts: Technic, Connector  55615  Technic, Pin Connector Perpendicular 3 x 3 Bent with 4 Pins Catalog: Parts: Technic, Connector  62462  Technic, Pin Connector Round 2L with Slot (Pin Joiner Round) Catalog: Parts: Technic, Connector