Simpson 7/8 in. x 21 in. SDS-Max Quad-Head Carbide Drill Bit MDMX08721Q Anchors Secures 1/2"

Secures 1/2"

with 1-1/8-inch cutting length and 1/2-inch shank

4-Sided Insert Knife Knives are profiled on 4 sides - rotate to a new edge as each dulls

Thread grippers hold each bolt in the same location and height

purpose-built for scissor truss applications on 2x truss and 2x6 wall assemblies

Simpson 7/8 in. x 21 in. SDS-Max Quad-Head Carbide Drill Bit MDMX08721Q Anchors Secures 1/2"Key Features Uniformly Brazed Carbide Inserts: Uniformly brazed carbide inserts resulting in longer bit life. Self Centering Tips: Self centering tips for accurate hole placement. Chromium Nickel Molybdenum Steel Alloy Body: Chromium nickel molybdenum steel alloy body ensures hammering quality and extended service life. Heat Treatment & Shot Peened Finish: Heat treatment procedures and shot peened finish increase surface hardness, drilling speed,