●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):M8 x 20●Blade Width D (mm):31●Blade Height H (mm):17.0●Butterfly/Screw: SUSXM7
