This is the Du-Bro Nylon Wing Mounting Kit.

Features

All the hardware needed to make a bolt on wing.
Nylon mounting blocks.
Nylon wing bolts.
Metal washers, nuts and screws.
Screws have a slotted drive insert.

Includes

(2) Blocks (4) Screws
(2) Wing Bolts (4) Nuts
(2) Wing Bolt Washers (4) Lock Washers
(4) Flat Washers

Specifications

Nylon wing bolts- Length: 2"
Thread: 1/4-20
Wing bolt washer- Diameter: 1/4"
Mountng blocks- Thread: 1/4-20
Screws- Thread: 4-40
Nuts- Thread: 4-40

Requires

3/32" Drill Bit
1/4" Drill Bit