10-8X3 1/2 6 Lobe Flat Nib Coarse Thread Type17 Exterior screw Part Thread 18 8 Stainless Steel (Pack Qty 500) BC-1056DTF17188

The deeper thread design offers greater resistance to pull-out forces. The six-lobe recess transmits drive torque with less required downward pressure 18-8 Stainless