and bolt set

bolts brass bristol clutch construction crossrecess double doublesquare dowels element engineering fasteners fastening frearson hardware head heads hex iron linealralhalrt mechanic mortorq nail obstaclepin oneway pentalobe phillipsph polydrive pozidrivpz protruding robertsonscruloxsquare screws slot spanner spline square steel supadriv tool torqset torx tp3 triwing triple ttap type types work wrench zinc