These closed ends is made from premium copper and is for the connnection of cables. The size comes as 6mm sup2;/10mm sup2;/16mm sup2;/25mm sup2;/35mm sup2;/50mm sup2; . Each of them is durable for long time of using. Their electrical conductivity is very impressive. For automibile repairing workshops and many other professionals, this wire connector is indispensable. Feature -Color: Silver. -Material: Copper. -Size: 17x10x2.3cm/ 6.69x3.93x0.90inches. -These closed ends is made from premium and is for the connnection of cables. -Each of them is durable for long time of using. -Their electrical conductivity is very impressive. -For automibile repairing workshops and many other professionals, this wire connector is indispensable. -Tinned for corrosion protection, excellent for outdoor installations and marine environments.