Tianjin Flat Head Self Tapping Wood Countersunk Screw with Rib - China Screw, Countersunk Screw | Made-in-China.com
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Socket Flat Countersunk Head Cap Screw, 1/4-20 x 1/2", Alloy Steel, Black Oxide, Hex Socket (Quantity: 100) Coarse Thread, 1/4 inch Allen Bolt, Length: 1/2 inch, Full Thread: Amazon.com: Industrial & Scientific