This is the 2-56 x 1/2 in. Bolt Set with Lock Nuts from Du-Bro.
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 in. ID).
4 Flat Washers
4 Lock Washers
Thread Size : 2-56
Screw/Bolt Length : 1/2 in.