#6 x 31mm(1-1/4'')..Pan head Zinc Pl screw.Thead Tapping
Pan head Tapping Thread Robertson Steel Screws.
The Original /L Robertson Square drive screw..
Type A shhet metal threads for tapping into sheet metal,plastic or wood.
Sharp point for excellent material engagement and thread starting.
Variety of sizes and head styles.
HVAC & Plumbing.
Windows and Doors
PVC & Plastics
#1 is the driver bit size for #6 gauge screws.
This is a GREEN colour coded bit or hand driver.