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