This is the 2-56x1/2" Bolt Set with Lock Nuts from Du-Bro.
FEATURES: High strength steel construction. Round head screws/bolts with a slotted drive insert. Plain Silver 2-56 lock nuts with Burgundy nylon inserts. Plain Silver flat washers (.083" ID).
INCLUDES: (4) Bolts (4) Flat Washers (4) Lock Washers
SPECS: Thread Size: 2-56 Screw/Bolt Length: 1/2"