Product Info Catalog Hardware Fasteners Screws Masonry Screw, 5/16 x 4-In. Star Flat Head, 50-Pk. Masonry Screw, 5/16 x 4-In. Star Flat Head, 50-Pk. Request a Quote UPC: 738287512359 SKU: 192491 Model Number: 51235 Torquemaster, 50 pack, 5/16" x 4", star flat head masonry screw. Added Torque, reduces the risk of cam-out. Quick, this two step system installs quickly and provides a neat finish. Safe, no dangerous powder actuated tools needed. Removable, screws can be easily removed. Coating, features Blue Ruspert finish for rust resistance.