These 3/8"-24 Fine Thread Thumb Screws feature a durable 304 stainless steel screw securely press-fit into a molded Acetal Plastic (Delrin) knob, creating a precise, corrosion-resistant assembly designed for industrial, mechanical, and shop applications. The smooth-turning Delrin knob provides excellent grip, dimensional stability, and chemical resistance, making it suitable for frequent adjustments in jigs, fixtures, clamps, or equipment panels. The 304 stainless steel bolt resists rust and galling for long-term performance in humid or outdoor environments. Ideal for assembly, maintenance, and prototyping where tool-free tightening and fine-thread precision are required.