6-20 X 1 Thread Cutting Screws / Phillips / Pan Head / 18-8 Stainless / Plain / Type 25 Plastic ring creates countersunk recess

Plastic ring creates countersunk recess to keep threads clean from pour residue

Serrations on underside of hex washer head lock against the fixture

DeWALT SKU-DFM44EMF330-The Crete-Flex anchor is a 410 stainless steel screw anchor for light to medium duty applications in concrete and masonry block base materials

DeWALT SKU-DFM4EUH315-The UltraCon SS4 anchor is a 410 stainless steel screw anchor for light to medium duty applications in concrete and masonry block base materials

a lower hardness heat treatment provides Grade 5 bolt mechanical properties

6-20 X 1 Thread Cutting Screws / Phillips / Pan Head / 18-8 Stainless / Plain / Type 25 Plastic ring creates countersunk recess