●Set in the bolt with an original setting technology of a butterfly part which uses the heading butterfly nut technology.●Guaranteed torque conforms to JIS and it has sufficient strength as a screw to be tightened by hand.●Nominal Diameter (d x L):M4 x 25●Blade Width D (mm):21●Blade Height H (mm):11.8●Soft Steel Wire Rod(SWRM8 to 10R)●Surface Treatment: Unichrome Plated Finishing
