Simpson SSDHPD212S Deck-Drive DHPD Hardwood Deck Screw Collated #10 x 2-1/2 in. Type 305 SS 1000-Qty MSTCB Pre-Bent Strap What does the annular-ring shank

What does the annular-ring shank do compared to a smooth shank

repeatable speed control

Includes a 2 Speed Trolley (3Ph) for smooth

Grouted masonry

Simpson SSDHPD212S Deck-Drive DHPD Hardwood Deck Screw Collated #10 x 2-1/2 in. Type 305 SS 1000-Qty MSTCB Pre-Bent Strap What does the annular-ring shankThe Simpson Deck Drive DHPD Hardwood Screw (SSDHPD212S) is a #10 x 2 1 2 in. collated deck screw engineered specifically to fasten the hardest wood products with ease and efficiency. Its unique paddle style drill point virtually eliminates splitting without the need for predrilling, saving time and reducing labor on every job. Cutting wings on the shaft counterbore through dense hardwood material, allowing the compact head to countersink cleanly for a