[Features]: ● flanges and nut in one. ● Hands can not reach the surface to the nut. [Occasion]: ● Equipment, Construction, Carpentry, Plumbing, construction, electrician. [Specifications] ● bis Diameter: M4 under hole diameter (mm): 8.2 ● Total length (mm): 17.5 ● board thickness (in mm): 0.53 ● breaking torque (kgfcm): 50 ● nuts Length: MM14 X 0 [Specifications 2] ● board thickness: 0.53 in. 0 mm [Material] ● finish zinc diecast