Socket Head Shoulder Screw, 1/4 inch x 3/8 inch, Heat Treated Alloy Steel, Black Oxide, 10-24 Thread Size (Quantity: 25 pcs), Shoulder Diameter: 1/4 inch, Shoulder Length: 0.375

1You may also like Seals-it Firewall Grommet, 1 Split Hole, 3 in OD, 1/2 in ID, Flat (Qty 1)$$Hardware.