FINE THREAD 1 1/2" Wide Clamping Knob. Thickness: 7/16" Has an ergonomic sturdy grip for fast adjustment without a wrench. The ergonomic grip provides strong torque and easy manual operation. 304 Stainless Steel Bolts – highly resistant to corrosion and rust, making them ideal for both indoor and outdoor use, even in harsh environments or areas exposed to moisture. Durable and long-lasting for secure fastening. Versatile Design – Ideal for machinery, plates, panels, jigs, fixtures, and DIY projects; provides quick hand installation and removal for tool-free adjustments in shop, home, or field use. Acetyl Thermoplastic Knob – Hard, durable, chemical- and moisture-resistant material offers lightweight, non-conductive performance for easy tightening. Built in USA by Family-Owned Small Business, Backed by a Lifetime Warranty 1/4"-28 x 1" Clamping Thumb Screw Bolts Type: Fine Thread Round Black Knob Grip Pack Size: Pack of 4 Specifications: Thread Size: 1/4"-28 (Fine Thread) Length: 1 inch Material: Thermoplastic Finger Grip Diameter: 1 1/2 inches Head Type: Tee Head Finish: Stainless Steel 18-8 Features: Durable construction ensures longevity. Ideal for clamping applications in various projects. Easy to grip design for comfortable use.