This is general-purpose Uxcell a12031300ux0388 6 Position Screw Terminal Covered Barrier Strip having maximum  600V, 25 Amp capacity.

Specifications:

1. Product name: barrier terminal block; material: metal, plastic
2. Rated value: 600V 25A; Poles: 6P (dual row)
3. Size: 91 x 30 x 17mm/ 1. 8″ x 1. 2″ x 0. 67″ (l*w*t); color: black
4. General purpose connector for electrical and electronics projects and circuits.