[Dimension] M7 x 14mm x 1mm / 0.28" x 0.55" x 0.04" ( Inner Dia* Outer Dia* Thickness)
[Highly Compatible] Universal with screws and bolts of same sizes and feature solid bearing surface to prevent nut/bolt head from tearing through material.
[Durable Construction] Copper material to withstand use in automotive and electrical connection on household application with tighter seal.
[Preventing Dispersion and Loosening] Smooth surface can reduce friction between fasteners, preventing isolates, loosening and dispersion pressure.