Features: Pure-copper terminal block, high efficiency, bakelite insulation material, with perfect safety performance. Nut system is simple to install and flexible to tighten the connector without worrying about loosening the bolt from the bolt. Widely used in the separation and distribution of welding machines, charging generators, ships, trucks, automobiles, solar cells. Use heavy duty 3/8" x 16 (9.525mmx1.5) brass terminals. Batteries that easily fit in 1-1/4" holes, provide active isolation via terminal connections. Connectors are used to easily connect power and ground. Conduit style metal lock nut ensures safe installation in the harshest conditions. Package Includes: 1x Feed-Thru Panel Specifications: Material:Copper+Rubber Height:Approx.5.3cm/2.08inch Color:Red/Black note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks for your understandings.