1 1/2-6 L9 Hex Nut Alloy Cadmium Yellow and Wax Coated Domestic USA (5) LedgerLOK Ledger Board Fasteners which means you can use

which means you can use them when you work in the same wall without them coming loose

5/8-18 x 3 3/4 Grade 8 Hex Cap Screw Yellow Zinc Plated

1/2-20 x 6 1/2 Socket Cap Screw Alloy

#53 Heavy Duty Drill Bit - Stubby Length

1 1/2-6 L9 Hex Nut Alloy Cadmium Yellow and Wax Coated Domestic USA (5) LedgerLOK Ledger Board Fasteners which means you can use1 1 2 6 L9 Hex Nut Alloy Cadmium Yellow and Wax Coated Domestic USA (5) . L9 High Tensile Strength Hex Nuts are designed for use in high stress, severe service environments. The highest mechanical strength off the shelf fastening system available, its special features control torque tension characteristics to develop high clamp loads when using properly controlled tightening methods. Brighton Best manufactures L9 nuts from AISI alloy steels. L9