The threads of this fastener utilize a heavy-duty design

ceramic-coated

1/4-28 x 2 3/4 Grade 8 Hex Cap Screw Yellow Zinc Plated Domestic USA (100)

#35 High Speed Aircraft Bit

7/16-14 x 3 1/4 Grade 5 Hex Cap Screw Plain Domestic USA (250)

1/4 x 3 3/4 Simpson Flat Head Titen Turbo™ Concrete and Masonry Screw Anchor Zinc Plated w/ Ceramic Coat Blue (T30 6-Lobe) - Box (100) 1-14 Grade 8 Hex Cap Screws Yellow Zinc Plated The threads of this fastenerSimpson Flat Head Titen Turbo Concrete and Masonry Screw Anchors are 1 4 x 3 3 4 inch zinc plated and ceramic coated fasteners with 6 lobe T30 drive design that provide superior holding power in concrete and masonry applications. This box of 100 will provide the necessary support for your project.