Knife Thread Insert System of Measurement Inch Insert Diameter 29/64 in Overall Length 1/2 in Internal Thread Size 1/4 In.-20 Thread Direction Right Hand Thread Type Coarse Material Brass Material Grade/Class C3604 Finish Plain Drive Type Slotted Drill Bit Size 25/64 in Compatible Material Wood Minimum Material Thickness 1 in Maximum Hole Diameter 0.391 in Manufacturer Location Globally Sourced Compatible with Grainger Part Number 4ZE54