Stainless steel IP68 Connection JointsBrass Nickel plated ModelWiring hole DiameterCable DiameterReference International StandardS7.5 mm5.5-7 mm30x0.5, 3x0.75A10.5 mm7.5-10 mm2x1, 2x1.5, 3x1, 3x1.5, 4x1B13.5 mm10.5-13 mm2x2.5, 2x4, 3x2.5, 4x2.5, 3x2.5+1.5C17.5 mm13.5-17 mm2x6, 3x4, 3x6, 4x4, 3x4+1x2.5D20.5 mm17.5-20 mm4x6, 3x6+1x4, 5x4+1x4 Connection Joint