Knife Thread Insert System of Measurement Inch Insert Diameter 3/8 in Overall Length 1/2 in Internal Thread Size 1/4 In.-28 Thread Direction Right Hand Thread Type Fine Material Stainless Steel Material Grade/Class 18-8 Finish Plain Drive Type Slotted Drill Bit Size 25/64 in Compatible Material Wood Minimum Material Thickness 19/32 in Maximum Hole Diameter 0.391 in Compatible with Manufacturer Model Number DT-428 Includes (6) Threaded Inserts Drill Drive Tool