Tooth-like nibs under the head allow the screw to countersink itself- Square X head accepts both square drive and Phillips bits.
Countersinking Screws
备件清单816_厦门纪扬科技有限公司
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Centerline #8 x 1-1/2'' Flat Head Square X Self
Ultimate Square Drive Flat Head Screws #8
8 x 1-1/4'' Flat Head Square X Self-Countersinking Wood Screws
#8 x 1 Flat Head Wood Screws - #2 Philips Drive
Everbilt #8 x 1-3/4 in. Phillips Flat Head Zinc Plated Wood Screw
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Simpson Strong-Tie Anchoring, Fastening and Restoration Systems
Peachtree Woodworking Catalog Pages 51-100 - Flip PDF Download
How to Make and Wire a Lamp
Cutting Tools Catalog - Chromate Industrial Corporation