Finsert Insert Type Finsert System of Measurement Inch Overall Length 3/8 in Insert Diameter 21/64 in Thread Size 1/4 In.-20 Thread Direction Right Hand Thread Type Coarse Material Brass Material Grade/Class C3604 Finish Plain Flange Style Al Ras Body Texture Smooth Number of Fins 2 Compatible Material Plastic Wood Drill Bit Size 21/64 in Minimum Material Thickness 7/16 in Maximum Hole Diameter 0.328 in Manufacturer Location Made in USA Flange Diameter 0.357 in