Features: 4 different size of good classification. To meet your designs requirements such as electronic experimentation and DIY projects. Use holes on the tinplate for easy soldering of component for your project, 4 mounting holes is very easy to install. Make from FR4 fiberglass materials, offering durability and long terms performances for your projects. The pre-tinned holes across the circuit board simple the soldering of component, facilitating project integration. Plate hole spacing: 2.54mm/0.1in; Pin spacing 2.54mm/0.1in (40pin); KF301 Terminals spacing: 5.08mm/0.2inch. Specifications: Materials: Plastic Box Size: about 14x8x3.50cm/5.51x3.15x1.38inch Plate hole spacing: 2.54mm/0.1in Pin spacing 2.54mm/0.1in (40pin) KF301 Terminals spacing: 5.08mm/0.2inch Voltages: 300 Current: 16A Package Includes: 5Pcs 2x8cm PCB Printed 5Pcs 3x7cm PCB printed 5Pcs 4x6cm PCB printed 5Pcs 5x7cm PCB printed 5Pcs 40Pin Straight Needle 5Pcs 40Pin Single Row Male Header 5Pcs Kf301-2p Terminals 5Pcs Kf301-3pin Terminals 1Pc Plastic Box note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to difference between different monitors, the picture may not reflect the actual color.