6 hole strips with interleaved power and ground rail tracks on a high-quality, single-sided FR4 glass-epoxy circuit board. 38 x 62 holes, 0.037" holes are drilled on 0.1" (2.54mm) centers. Box is extruded aluminum with metal end plates and polycarbonate plastic bOKAYels. 11 built-in card guides; screws & self adhesive rubber feet included.