HILLMAN 1/4 in. D X 3-3/4 in. L Steel Flat Head Concrete Screw Anchor 100 pk Size:3/4 It has an adjustable tilt

It has an adjustable tilt for directional airflow

It knots securely and can be used for chalk and staging twine

Simple enough for kids and complex enough for adults

regardless of if they are exposed to extreme weather

BestAir 12x12x1 pleated MERV 8 rating

HILLMAN 1/4 in. D X 3-3/4 in. L Steel Flat Head Concrete Screw Anchor 100 pk Size:3/4 It has an adjustable tiltTapper Concrete Screw Anchors are manufactured for top performance in masonry based applications. Brand Name: HILLMAN Diameter: 1 4 in. Length: 3 3 4 in. Material: Steel Head Style: Flat Head Product Type: Concrete Screw Anchor Number in Package: 100 pk Screw Included: Yes Packaging Type: Boxed Thread Type: High Low Required Drill Hole Size: 3 16 in. Screw Length: 3 3 4 in. Minimum Embedment: 1 in. Capacity: 210 lb Application: Brick, Concrete, Hollow