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This is the 4-40x1" Socket Head Bolt Sets with Lock Nuts from Du-Bro. FEATURES: High strength steel construction. High round cap head screws/bolts with a hexagon socket drive insert. Plain Silver flat washers (1/8" ID). Plain Silver 4-40 lock nuts with Black nylon inserts. INCLUDES: (4) Bolts (4) Flat Washers (4) Lock Nuts SPECS: Thread Size: 4-40 Screw/Bolt Length: 1" tjt 040702 ir/kh kr3/14/03 BOX DIMENSIONS: 2.25" W. X .50" H. X 2.25" L. BOX WEIGHT: .02 LBS.