PR2H1 ProtoBoard Box1 Kit - KBOX1-AC-BK-PR2H, Black Enclosure with 4 Card Guides and Size 1 2-hole pre-cut strip PCB Box is black extruded aluminum with metal end plates and polycarbonate plastic bezels, 3.15 x 2.13 x 0.91 inches (80 x 54 x 23 mm) 4 built-in card guides for Size 1 PCBs (80 x 50mm) Convenient 2-hole ProtoBoard pattern provides an easy way to connect parts 31 x 19 holes, 0.037" holes are drilled on 0.1" (2.54mm) centers. Four 0.125 mounting holes Screws & self adhesive rubber feet included