This is the 4-40x1-1/4" Mounting Bolt Sets with Blind Nuts from Du-Bro.

Features

High strength steel construction for mounting engines.
Round head screws/bolts with a slotted drive insert.
Plain Silver 4-40 blind nuts.
Plain Silver flat washers (.12" ID).
Plain Silver slotted lock washers (.12" ID).

Includes

(4) Bolts
(4) Flat Washers
(4) Lock Washers
(4) Blind Nuts

Specifications

Thread Size: 4-40
Screw/Bolt Length: 1-1/4"