Essential for car and small engine repairs.Copper washers are usually used inside piping, electronics, family products and bio applications, as copper is malleable and ductile- a biostatic floor that may be a nice heat conductor and, if very pure, a good electric conductor.Copper Provides a denser seal and larger heat patience than steel and rubber washers.Product name: Copper washerTotal size: 10 x 14 x 1 mm / 0.4 inches x 0.55 inches x 0.04 inches (inside Ø * of * T)Material: copperColor: copper base colorNet weight: 13gPackage Contents:20 x copper washerOnly the above kit content, other products should not included.Note: Light shooting and diversified displays may cause the colour of the object within the picture a bit assorted from the genuine thing. The size allowed error is +/- 1-3cm.