The 3088-M is a molded plastic knob designed for rotary control and adjustment applications. It features a body constructed from Nylon 6/6 (ZY2 or ZY6) material in black color with textured areas up to the parting line for improved grip. The knob incorporates a 5/16-18 UNC-2B threaded brass insert (I0528, H.H. brass) with a 0.50-inch hub and threads, and includes a 5-degree taper with 0.12-inch typical wall thickness. The overall diameter is 2.50 inches with a height of 0.44 inches and a depth of 0.31 inches. This knob is commonly used in industrial equipment, control panels, and consumer appliances where reliable rotary control and durability are required.