10-32 x 1-1/2" Thumb Screw Stainless Steel - Black Knurled Round Plastic Knob - Fine Thread Thumbscrew - Length: 1.500" - Proudly Built in USA - Package of (4): Amazon.com: Industrial & Scientific
80/20 Inc, 3066, 10 Series, 1/4-20 x .75" Flanged Button Head Socket Cap Screw (FBHSCS) (25 Pack): Amazon.com: Industrial & Scientific