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"