6-40 x 3/8 Fine Thread Socket Head Cap Screw Black DFAR MBF8 while the Type U drive

while the Type U drive requires a special tool for installation

1/4-20 x 1 Phillips Flat Undercut Full Thread Self-Drilling Screw

1 inch length

This 1/4-20 x 1 1/4 hex machine bolt is made of steel and has a hot-dip galvanized finish

6-40 x 3/8 Fine Thread Socket Head Cap Screw Black DFAR MBF8 while the Type U driveThe 6 40 x 3 8 Fine Thread Socket Head Cap Screw Black DFAR is a high quality fastener designed for use in demanding applications. It is made from alloy steel and features a black oxide finish for corrosion resistance. The screw has a socket head drive, which allows for easy installation and removal. The fine thread design provides a secure hold in thin materials. This screw is compliant with the DFAR (Defense Federal Acquisition Regulation