Product Description Specifications Silicone Pull Plug: Major Dia: 0.312 IN. 7.9 mm; Minor Dia.: 0.147 IN. 3.7 mm; Length: 1 IN. 25.4 mm; Hole thread: 19/64; Box Qty: 500 Max Temperature: 600° Major Diameter: 0.312 inch Metric Major Diameter: 7.9 mm Minor Diameter: 0.147 inch Metric Minor Diameter: 3.7 mm Material: Silicone Color: Grey