Gold-plated brass terminal posts one with a red & one with a black knob on a twin base having one part red & one part black so that the part on the outside of the chassis can be either red or black. Rated 10A at 250V. Each post has a 4mm top socket & a 2.1mm dia. hole in post. Knob size 16 x 15mm dia. Fits panels from 1.2mm dia. to 7mm thick. Panel cut-out requires two 12.7mm holes on 18.5mm centres. Bezel size 35mm x 16mm.