Head Set Product Type Head Set Compatible Thread Size 5/16 In.-18 Compatible Rivet Nut Body Type Hex Material Steel Overall Length 2 1/2 in System of Measurement Inch Compatible Insert Type Rivet Nuts Compatible with Manufacturer Model Number FL5-HS-00740 FL5-HS-00840 FL5-HS-09140 M-3118-250 Includes Headset Only