AUSTOR 30 Pcs Double Sided PCB Board Prototype with 20 Pcs Male and Female Header Connector and 10 Pcs Screw Terminal Blocks PCB Board 30 Pieces in 4 different sizes, a good assortment to meet your design demands such as electronic experiments and DIY projects. Easy to use: pre-tinned plated holes on the board make it very handy to solder components and sensors for your projects. Easy installation: 4 mounting holes at the corners of the board are very convenient for installing them together. Material: high quality glass fiber FR4 Hole-pitch: 2.54 mm Header Connector Pitch: 2.54mm, number of pins: 40pin. Type of row: single row, type of connector: straight. Great tool for Arduino proto shield. Screw Terminal Block Pitch: 5.08mm, 5.08-301-2P Rated voltage: 300V, rated current: 16A Package include 2x8cm Prototype PCB universal board * 8 3x7cm Prototype PCB universal board * 8 4x6cm Prototype PCB universal board * 7 5x7cm Prototype PCB universal board * 7 40Pin male header connector * 10 40Pin female header connector * 10 Screw terminal blocks * 10 Free plastic box * 1 Product Warranty Austor Direct Customer Service Team is dedicated to offering our valued customers a great and professional services - Timely email reply, Helpful solutions, Refund & Return Warranty. All Austor products supply 45 days money-back & 18-month warranty. Any questions you have, please don't hesitate to contact us. We will get you back within 24hours.