Simpson 9/16 in. x 21 in. SDS-Max 2-Cutter Head Carbide Drill Bit MDMX05621 Nailers The HDIA25SS requires a setting

The HDIA25SS requires a setting tool for proper installation

Designed to provide solid support underneath the joist

and (2) STN22 hex-head washers (sold separately)

What size header is the HH6 designed to support

saving time and eliminating rework

Simpson 9/16 in. x 21 in. SDS-Max 2-Cutter Head Carbide Drill Bit MDMX05621 Nailers The HDIA25SS requires a settingSimpson MDMX05621 9 16 in. x 21 in. SDS max Shank Drill Bit is a premium quality, professional grade 2 cutter head SDS max drill bit from Simpson Strong Tie, engineered for demanding concrete drilling and demolition applications. The proprietary flute geometry reduces vibration and optimizes impact energy transfer from the rotary hammer into the drill bit tip, delivering enhanced drilling speed and durability while reducing noise, stress, and