[Dimension] M8 x 13mm x 1mm / 0.32" x 0.52" x 0.04"(Inner Dia x OD x T)
[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.