Hillman 1/4 in. Diameter x 1-1/4 in. Length Zinc-Plated Steel Hex Bolt, 100 Pack Vinyl Stair Trim Self-Locking Square Neck: Prevents bolt

Self-Locking Square Neck: Prevents bolt rotation for easier installation

or lose R-value over time

Ready to Use: Ships assembled with included hardware

They are designed for tight

Q: What drill bit size is needed

Hillman 1/4 in. Diameter x 1-1/4 in. Length Zinc-Plated Steel Hex Bolt, 100 Pack Vinyl Stair Trim Self-Locking Square Neck: Prevents boltHillman 1 4 in. x 1 1 4 in. Zinc Plated Hex Bolt (100 Pack) Durable zinc plated steel hex bolts designed for fastening wood to wood, wood to metal, and metal to metal. Grade 2 construction with a partially threaded shank provides reliable clamp force and reduced shear movement for general purpose applications. Key Features: General Purpose Strength: Grade 2 steel suitable for most everyday fastening jobs Corrosion Resistant: Zinc plated finish helps