Tooth-like nibs under the head allow the screw to countersink itself- Square X head accepts both square drive and Phillips bits.
Centerline #8 x 1-1/2'' Flat Head Square X Self
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Each of these screws features cutting nibs under the head that help it sink flush with the surface without need for a countersink bit. In addition, their WoodMaster serrated threads offer fast, no-wobble starting and reduced splitting. The low-friction lube finish lets them sink in quickly for a tight hold.
Rockler Centerline #8 x 1-1/2'' Flat Head Square x Self-Countersinking Fluted-Tip Wood Screws, Zinc, 100-Pack
Catalog: Anchoring, Fastening, Restoration and Strengthening
8 x 2-1/2'' Flat Head Square X Self-Countersinking Fluted-Tip Wood
Countersinking Screws
Centerline #6 x 1'' Trim Head Square Drive Wood Screws
Everbilt #8 x 1-1/2 in. Zinc Plated Square Flat Head Wood Screw (5
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8 x 1-1/4'' Flat Head Square X Self-Countersinking Fluted-Tip Wood
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Ultimate Square Drive Flat Head Screws #8
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