Concrete Machine Screw Anchors Are Female Type Concrete Anchors Designed for Anchoring into Concrete, Brick or Block; Concrete Machine Screw Anchors have Internal Machine Screw Threads and Require a Setting Tool for Installation; Great for Installation in Older Concrete Where Crumbling is a Concern; Lead Alloy Molds Itself to Concrete Surface for a Tight Fit; Zamac 7 Internally Threaded Core; Requires Layout or Hole Spotting

Specifications:

Type: Lead Machine Screw
Anchor Size: 1/4 Inch
TPI: 20
Drill Size: 1/2 Inch
Thread Length: 1/2 Inch
Embed Depth: 7/8 Inch
Material: Lead
Finish: Lead