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Amazon.com: Socket Set Screw, Knurled Cup Point, 7/16-20 x 1/2", Alloy Steel, Black Oxide, Hex Socket (Quantity: 50) Fine Thread, Thread Diamater: 7/16 inch x Length: 1/2 inch : Industrial & Scientific
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Amazon.com: 1/4"-20 Socket Set Screws Knurled Cup Point 18-8 Stainless Steel 1/4"-20 x 5/8" Qty 100 : Industrial & Scientific
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vintage S-K 1/2" drive --- 12 knurled sockets --- see pics --- 1 1/16" to 7/16" | eBay
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3/8"-16 x 5/8" Coarse Thread Socket Set Screw Knurled Cup Point Alloy Steel Black Oxide | ASMC Industrial
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