Features: 1.Printed Circuit Board: This prototype screw board is composed of screw terminal block, reliable printed circuit board carrier, FR 4 glass fiber printed circuit board. 2.Fine Workmanship: This terminal block features fine workmanship and stable performance, easy to use. 3.Durable Material: This shielding board is made of premium printed circuit board material, highly durable. 4.For MEGA 2560 R3: This prototype screw/terminal board shielding board is designed for MEGA 2560 R3. 5.Accurate Size: This terminal block shielding board also features accurate size and proper weight, ensure high stability. specification:Item Type: Prototype Screw Board Material: Printed Circuit Board Printed Circuit Board Size: Approx. 120.24 x 77.2mm / 4.7 x 3.0in Pads Grid / Pitch: Approx. 2.54mm / 0.1in Hole Diameter: Approx. 0.8mm / 0.03in Terminal Block Pitch: Approx. 3.5mm / 0.14in Hole Diameter: Approx. 1.2mm / 0.05in Terminal Block: Pitch: Approx. 3.5mm / 0.14in, Mini Terminal Blocks, Total 84 Pins (3pole x 24pcs, 2pole x 6pcs ). Wire Range :26 to 16AWG, Length: Approx. 5mm / 0.20in, Screw M2 Steel, Pin Head and Cage Brass. Socket: Pitch: Approx. 2.54mm / 0.10in Pin Length: Approx. 15mm / 0.59in Single Row 10Pin (1Pin), Single Row 8Pin (5Pin), Double Row 18Pin (1Pin) PackageList:1 x Prototype ScrewBoard